Question

Answe for the question.

2. What's the length of side b in the figure below?
b
7 cm
13 cm

Answer 1

There is a right angled triangle, in which,

Perpendicular = 7 cm

Hypotenuse = 13 cm

Base = b cm

As we know the formula for "Pythagorus theorem":

\begin{gathered}H^2=B^2+P^2\\\\13^2=b^2+7^2\\\\169=b^2+49\\\\169-49=b^2\\\\b^2=120\\\\b=\sqrt{120}\ cm\end{gathered}

H

2

=B

2

+P

2

13

2

=b

2

+7

2

169=b

2

+49

169−49=b

2

b

2

=120

b=

120

cm