The perimeter of an isosceles right triangle is 13cm, and the length of its hypotenuse is 5cm. Find its area

The perimeter of an isosceles right triangle is 13cm, and the length of its hypotenuse is 5cm. Find its area

The length of the hypotenuse is 5. According to the perimeter, the right angle side is 4. The area is 1 / 2 * (4 * 4) = 8

A 20.5cm long iron wire is used to form an isosceles right triangle with 8.5cm long at the bottom. The area of the triangle is () cm square

(20.5-8.5) / 2 = 6, s = 6 * 6 / 2 = 18 square centimeters. But your isosceles right triangle is not authentic!

The height of the isosceles right triangle is 5cm, and the angle between the height of the waist and the bottom is 60 degrees. What is the length of the bottom?
I don't understand

The height of the waist is 5, that is, the right angle side is 5
It is also known that it is an isosceles right triangle
So the hypotenuse is
√(5²+5²)=5√2

The meaning of wire specification

R - flexible cable (wire) for connection, flexible structure, V - insulated PVC, V - PVC insulated, V - PVC sheathed, B - flat (flat), s - twisted pair, a - tinned or silver plated, F - high temperature resistant, P - braided shield, P2 - copper tape shield, P22 - steel tape armored, Y - prefabricated, generally omitted, or polyolefin sheathed

Cable specification and model: 10 × 3 + 6 × 1

In general, there is no such standard method, but the normal understanding should be the cable for motor power supply line, three 10 square phase lines plus a 6 square protective grounding wire. In practical application, the protective grounding wire for cable less than 16 square can be the same size as the power supply line

What does cable model yjv22-10-3x70 mean

Copper conductor cross linked polyethylene insulated PVC sheathed double steel tape wrapped armored PVC outer sheathed 10kV High voltage power cable, 3 cores, each conductor cross-sectional area 70mm & # 178;

What does yjv22-4 * 10 + E10 cable mean

Yjv22: XLPE sheathed, PVC insulated double steel tape wrapped armored power copper core cable
4x10 + E10: four 10mm2 plus one 10mm2 yellow / Green grounding wire
It is commonly known as 5x10 cable, e for special purpose

Meaning of English letters and numbers in wire and cable models
There are also numbers, such as bv500-4 * 50 + 1 * 25

In your cable, BV means copper core wire, 500 means rated voltage is 500V, 4 * 50 + 1 * 25 means the number and diameter of the cable are composed of four pieces of 50 square and one piece of 25 square

What does the model letter of the cable mean

Model meaning:
R - flexible cable (wire) for connection, flexible structure
V-pvc insulation. V-pvc insulation. V-pvc sheath
B - flat (flat)
S - twisted pair. A - tinned or silver plated
F - high temperature resistance
P-braided shield p2-copper tape shield p22-steel strip armor
Y-prefabricated, generally omitted, or polyolefin sheath
FD - product category code, refers to the branch cable. The Ministry of construction standard to be issued is represented by FZ, and its essence is the same
YJ - XLPE insulation
V-pvc insulation or sheath
Zr flame retardant
NH fire resistant
Wdz - halogen free low smoke flame retardant
WDN - halogen free low smoke fire resistant
For example: SYV 75-5-1 (a, B, c)
S: Radio frequency Y: polyethylene insulation V: PVC sheath a: 64 Series B: 96 Series C: 128 series
75:75 ohm 5: wire diameter 5mm 1: single core
SYWV 75-5-1
S: RF Y: polyethylene insulation W: physical foaming V: PVC sheath
75:75 ohm 5: outer diameter of cable is 5mm 1: single core
For example: rvvp2 * 32 / 0.2 rvv2 * 1.0 BVR
R: Flexible wire VV: Double sheathed wire P shielding
2: 2-core multi strand wire 32: each core has 32 copper wires 0.2: each copper wire diameter is 0.2mm
ZR-RVS2*24/0.12
Zr: flame retardant R: flexible cable s: twisted pair
2: 2-core multi strand wire 24: each core has 24 copper wires 0.12: each copper wire diameter is 0.12mm
Model and name
RV copper core vinyl chloride insulated connecting cable (wire)
AVR tinned copper core PE insulated flat connection flexible cable (wire)
RVB copper core PVC flat connecting wire
RVs copper core PVC stranded connecting wire
RVV copper core PVC insulated PVC sheathed round connection flexible cable
Arvv tinned copper core PVC insulated PVC sheathed flat connection flexible cable
Rvvb copper core PVC insulated PVC sheathed flat connection flexible cable
Rv-105 copper core heat resistant 105oC PVC insulated PVC insulated flexible cable
Af-205afs-250afp-250 silver plated PVC insulation high temperature resistance - 60oC ~ 250oC connecting flexible wire
2. The meaning of specification representation
Specifications are expressed in terms of number of cores, nominal section and voltage class
① Specification of single core branch cable: number of cables in the same circuit * (1 * nominal section), 0.6/1kv,
For example: 4 * (1 * 185) + 1 * 950.6/1kv
② Specification expression of multi-core stranded branch cable: number of cables in the same circuit * nominal section, 0.6/1kv,
For example: 4 * * 185 + 1 * 95 0.6/1kv
③ Specification expression of multi-core same sheath branch cable: number of cable cores × nominal section-t, such as 4 × 25-t
3. Complete model specification representation
Because the branch cable includes trunk cable and branch cable, and their specifications and structures are different, there are two ways to express them
① The main cable and branch cable are represented respectively,
For example: trunk cable: fd-yjv-4 * (1 * 185) + 1 * 950.6/1kv
Branch cable: fd-yjv-4 * (1 * 25) + 1 * 160.6/1kv
This method is particularly concise in design, and can easily express the different specifications of branch lines
② Connect the main cable and branch cable together, such as fd-yjv-4 * (1 * 185 / 25) + 1 * 95 / 160.6/1kv
This method is more intuitive, but it is only limited to the case that the branch cables are of the same specification, and can not represent the different specifications of the branch cables
As the branch cable is mainly due to 1kV low voltage distribution system, its rated voltage of 0.6/1kv can be omitted in design marking
2、 The meaning of Pinyin in product model (words without brackets)
A: (poly) amine (grease), installation, aluminum plastic sheath (alpeth)
B: Flat, half, braided (woven), pump, cloth, (poly) benzene (ethylene), glass (glass fiber), patch, parallel
C: Car, alcohol, mining (digging machine), porcelain, heavy (type), marine, storage (pool), magnetic charge, compensation, (yellow wax) silk, (III) vinegar (acid film), self-supporting
D: With, (not) drop (flow), lamp, electricity, (cold) freeze (i.e. cold resistant), Ding (base rubber), plating
E: Two (layer), field (outside), symmetrical structure (code), ethylene propylene rubber (EPR)
F: (poly four) fluorine (ethylene), divided (phase), non (flammable), fly (machine), foam polyethylene (YF)
G: Steel, ditch, modified paint, pipe, high pressure
H: Composite (metal), ring (oxygen paint), welding, flower, communication cable (use code), H (H type, namely split phase shielding structure), cold
J: Twist, strengthen, thicken, saw, Bureau
K: Empty, card, control, armor, hollow
50: Aluminum, furnace, wax, asphalt, thunder and phosphorus
M: Cotton (yarn), hemp, mother (thread), cap and film
N: (self) viscosity (property), mud (carbon), (high resistance) nickel (core), nickel (Dragon), fire resistance
O: Coaxial (structure code)
P: Row, (core) screen (shield), distribution (line), lean (Pan impregnation, i.e. dry insulation), signal cable (purpose code)
Q: Traction (lead car), paint, lead, light (type), gas, steam (car), high strength (polyvinyl acetal)
R: Soft, man-made silk, daily use, heat resistance
S: Brush, wire, RF (application code), double, steel plastic sheath, low smoke halogen-free flame retardant sheath
T: Copper, ladder, special, Tong, pottery, elevator, exploration
U: Mine, cotton (refers to asbestos), mine (use code)
5: (P) V (c) (PVC)
W: (earth) physics, wrinkle sheath, non-magnetic, high temperature resistant, outdoor, petroleum (use code)
10: Rubber (cable), polyamide, rubber (leather insulation)
Y: Hard, round, oil, oxygen, (resistant) oil, mobile (use code), polyethylene, pressure
Z: Polyester, paper, drill, medium, synthetic
YJ: cross linked polyethylene insulation
P2: copper tape shielding
Zrk: Series code, indicating flame retardant control cable

Alphanumeric meaning of myptj-3.6/6 cable

M: Cable for coal mine
Y: Mobile
Pt: metal shield
J: Monitoring core
Its full name is mobile metal shielded monitoring rubber sheathed flexible cable for coal mine. Purpose: cable for power connection of underground mobile transformer and similar equipment with rated voltage of 3.6/6kv. The insulation thickness is 4.0mm and the outer sheath thickness is 5.5mm. For manufacturing, please refer to mt818-2009