Dragan

Look closely at a diagram and try to spot all the triangles that have 2 congruent angles. Have fun.

60º + 61º + 61º + 179º + 179º = 540º

A_BCE = (2 * 7) / 2 = 7 u²

1/    Calculate angles AED and EAD

2/    By using the law of sines, calculate unknown sides  AD and ED

3/    Use Heron's formula to calculate the area of triangle ADE

Hint:    A_ABD = A_ABC - (A_BCE + A_ADE)

Right triangle ABC has one leg of length 6 cm, one leg of length 10 cm, and a right angle at A. A square has one side on the hypotenuse of triangle ABC and a vertex on each of the two legs of triangle ABC. What is the length of one side of the square in cm? Express your answer as a common fraction. 

Let the side of the square be  x

x / tan(B) + x + x / tan(C) = sqrt(6² + 10²)

x = 3.56997  

Why is this post blocked?!?

Problem 1. One digit of 970405 can be changed to make the result divisible by 225. What is the six-digit number after the modification?

970425 / 225 = 4313 

x = tan(36º) * 15 

The perimeter of an isosceles triangle is 36 centimeters and two sides of the triangle are in the ratio 2:7. What is the number of centimeters in the length of the longest side?

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An isosceles triangle is a triangle with two equal sides.

If the ratio of the two sides is 2:7 then the ratio of all 3 sides is 2:7:7  

 The length of the longest side is:>         7(36 / 16) = 15.75 cm