Question

ABC is a triangle right angled at a is equal to 20 centimetre and ac equal to 15 cm find the length of BC

Answer 1

Payithogorus theorem will be applied

Base^2 + Perpendicular^2 = Hypotenuse^2

here,

20^2 + 15^2 =25^

hence BC will be 25

Answer 2

by using formula

(bc)2=(ab)2+(ac)2

(bc)2=(20)2+(15)2

bc2=400+225

bc2=625

bc2=625

bc=25