Answer to Q195:

What is the area of the coloured square?The first and important information is that the shaded area is a square so all we need to do is find the length of one side.

We can find the hypotenuse of the triangle of base 2 and height 6 using Pythagoras theorem.

hyp² = base² + height²
hyp² = 2² + 6²
hyp² = 4 + 36
hyp = √40

So one of the side is √40 and area of a square = L²
area of shaded square = (√40)²
= 40 sq. unit

Answer: 40 sq. unit

Answer to Q193:

*If (A - A - A = 20), (B - B - B = 15) and (C - C - C = 25), then what is A + B + C?

A - A - A = 20*:
that means -A = 20
A = -20

B - B - B = 15-B = 15B = -15

C - C - C = 25-C = 25
C = -25

So A + B + C = -20 + -15 + -25
= -20 - 15 - 25
= -60

Answer: -60