It is known that in isosceles △ ABC, ab = AC. if the acute angle of the intersection of the vertical bisector of AB and the line of edge AC is 40 degrees, then the base angle of isosceles △ ABC ∠ B is 40 degrees______ ．

It is known that in isosceles △ ABC, ab = AC. if the acute angle of the intersection of the vertical bisector of AB and the line of edge AC is 40 degrees, then the base angle of isosceles △ ABC ∠ B is 40 degrees______ ．

① When de intersects with line AC, as shown in Figure 1, ∵ De is the vertical bisector of AB, ∵ AED = 40 °, ∵ a = 90 ° - AED = 90 ° - 40 ° = 50 °, ∵ AB = AC, ∵ ABC = 12 (180 ° - a) = 12 (180 ° - 50 °) = 65 °; when de intersects with the extension of Ca, as shown in Figure 2, ∵ De is the vertical bisector of ab

I want to ask - how to calculate the fractional power of a number? For example: how to calculate the 2 / 3 power of 3? What about the negative 2 / 3 power of 3?

A ^ (M / N) = a ^ m under N times radical
The reciprocal of a ^ m under a ^ (- M / N) = n root

The negative power of a number
I can't figure it out

The - K power of n = 1 / (n ^ k)

What's the good of pencils for us?

Pencils can be used to write; they can also be used as rulers to draw lines; they can also be used as gifts to show friendship; they can make profits when goods are sold; the lead of pencils can be used as lubricating powder after being ground into powder; they can also be used for makeup temporarily during performances; the sawdust cut off can be made into decorative paintings; a pencil can be sawn into several parts according to an equal proportion to make

What's the fifth advantage of pencils?

1. It can be altered; 2. It is environmentally friendly; 3. It is moderately soft and hard, and the words are very beautiful
I can't think of it

What are the advantages of hexagonal pencil over round pencil

There are all kinds of shapes, such as round ones, flat ones used by carpenters
According to the correct method of holding the pen, the hexagonal shape makes the middle finger, index finger and thumb on three planes separated, which is more comfortable
Round is easy to roll
Woodworking is only considered to be strong and durable
Hold out your hand and pose for the pen:
1: The posture of writing
2: The posture of drawing
You will find that the shape of the empty hand just matches the shape of the hexagon

What do 1 to 8b pencils draw and what are their characteristics

Pencil hardness is divided into ordinary pencil and drawing pencil according to the carbon content and the proportion of clay. The characteristics of drawing pencil are that the hardness of pencil lead is divided into 13 grades, which are distinguished by the English letters h and B. h means hard, B means soft, hardness h1-h6. The larger the number is, the stronger the hardness is, and the lighter the color is

As shown in the figure, the mass of the pencil is 6G, and the gravity it receives is______ N. It is known that the area of the end of the pencil is 0.4cm2. When two fingers press the pencil from both ends with 4N force, the pressure of the end of the pencil on the finger is 0.4cm2______ Pa. (take g = 10N / kg)

The gravity of the pencil g = mg = 0.006kg × 10N / kg = 0.06n; the pressure of the end of the pencil on the finger P = FS = 4n0.4 × 10 − 4m2 = 1 × 105Pa

The mass of a pencil is 6G. What's the gravity on it

m=6g=0.006kg
G=mg=0.006kgx9.8N/kg=0.0588N
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For a pencil, the area of the tip is 0.5mm2, and the area of the end is 0.4cm2. Two fingers press the two ends of the pencil with 4N force. How much pressure do the two fingers receive?

Finger pressure: pen tip P1 = FS1 = 4n0.5 × 10 − 6m2 = 8 × 106pa, closed tail P2 = fs2 = 4n0.4 × 10 − 4m2 = 1 × 105Pa; answer: the pressure on two fingers is 8 × 106pa and 1 × 105Pa respectively