Answer:
A:53
B:90
C:143
Step-by-step explanation:
angle A :
53º
angle B :
90 º
Angle C :
143 º
No
6^2+4^2=52
7^2=49
49 is not equal to 52, so no it is not a right triangle
Answer.
z = x+66(sum of two opposite interior angle of triangle is to the exterior angle)
=40 +66
=106
attached below
Area of rectangle = l x b
= (m-1) (m+1)
This is the difference of 2 squares
So
=m^2-1
