One angle in a triangle is 100 degrees. the other two angles are congruent. what is the measure of one of the missing angles?
(a) 40°
(b) 80°
(c) 130°
(d) 140°

A

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180°

let x be the measure of the congruent angles, then

x + x + 100 = 180, that is

2x + 100 = 180 ( subtract 100 from both sides )

2x = 80 ( divide both sides by 2 )

x = 40

Thus the measure of one of the congruent angles is 40°

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.