Question

please answer this please please​

Answer 1

Answer:

21 cm.................. .....

Answer 2

Uh! Difficult to explain without drawing. Will try

Let the base be BC.

A circle is drawn with BC as diameter

P is a point on AB & Q is a point on AC

Note that, triangles BPC & BQC are right angled as they are formed inside the semicircle.

—> Both BQ & CP are altitudes of the triangle ABC

—> Area of the triangle ABC

= 1/2*AB*CP = 1/2*AC*BQ

—> 1/2*28*18 = 1/2*24*BQ

—> 252 = 12*BQ

—> 252/12= BQ

—> 21 =BQ

Therefore, option C). 21cm is correct answer