A right triangle has an angle of 45 ° and its longest side is known to be 12 cm. The area of this triangle is______ Square centimeter

A right triangle has an angle of 45 ° and its longest side is known to be 12 cm. The area of this triangle is______ Square centimeter

With the hypotenuse as the bottom, the bottom is 12 cm, the height is 12 △ 2 = 6 (CM), 12 × 6 △ 2 = 72 △ 2 = 36 (square cm), so the answer is: 36

Given a right triangle, the length of the oblique side is 300, and the angle between the bottom and the right side is 30 degrees, how much is the length of the right side,

In a right triangle, the right side of 30 degrees is 300 * sin30 = 150
The other right angle side is 300 * cos30 = 150 times root 3

A right triangle knows a non right angle and a side length. How to find the other side length?
Please don't answer anything like sine cosine formula. I can't understand those names and codes. Answer directly
If the known angle is the opposite of the known edge, then the adjacent edge of the known angle equals sin, the known angle *. The hypotenuse equals
If the known angle is the adjacent non beveled edge of the known edge, then the beveled edge equals. The opposite edge equals
If the known edge is the hypotenuse of a triangle, then the opposite side of the known angle is equal to

Very simple ah, using the sine theorem, according to the three angles you said you know, with the sine theorem is very easy to come out

(find the rule by area) as shown in the figure, two right triangles with side lengths of a, B and C and a right triangle with both right sides of C form a new figure. What do you find when you use different methods to calculate the area of this figure?

The area of trapezoid is 12 (a + b) (a + b) = 12ab + 12ab + 12c2, that is, A2 + 2Ab + B2 = 2Ab + C2, so A2 + B2 = C2

Given both sides, how to solve a right triangle
For example, Tana = A / b = 35 / 28 = 1.25, how can you know that angle a is equal to 51 degrees, let alone how to solve it according to what

Tangent = opposite side: adjacent side, the ratio is 1.25, look up the trigonometric function value table, tangent = 1.25, the opposite angle is 51 degrees

How to find the degree of angle when solving right triangle
Do you have to use a calculator

1. Pythagorean theorem calculates the length of the other side: C ^ 2 = a ^ 2 + B ^ 2 A, B is the right angle side, C is the hypotenuse side
2. Sina = opposite side of a: the hypotenuse of A. look up the value of sin to get the degree
Similarly, cosa = edge: bevel; Tana = opposite edge: edge; COTA = edge: opposite edge
3. When calculating, pay attention to the value range of angle

How to find the degree of angle in right triangle

sin cos tan

As shown in the picture, a ship sails from west to East. At 9 a.m., it reaches m, 68 nautical miles southwest of a lighthouse P, and at 11 a.m., it reaches n, due south of the lighthouse. The speed of the ship is calculated

In RT △ PNM, COSM = MNMP, i.e. mn68 = 22 ∧ Mn = 342 ∧ v = 34211 − 9 ≈ 24.04 (knots)

1. Known Tana = 1.25, do not use a calculator, find the degree of angle A
2. Do not use a calculator, find the value of cos62 degrees
There are some ways to solve the problem with a calculator in the textbook.
However, in the textbook examples, the textbook only gets the answer directly, and this kind of problem appears again in the textbook exercises (and there is no explanation that the calculator can be used), I am very confused.

General look-up table or calculator, because of convenience or their own drawing, their own calculation
What can I do? I can't teach you. You can ask the teacher or your father
The following is a detailed drawing method

How to find the degree of a right triangle? In my opinion, the answer is 70.1 ° and 47.2 ° or something, not 30 ° and 45 ° and 60 ° or something. How can we find it

It's from trigonometric function table