Question

Find the perimeter and area of a semi-circle whose radius is :
(i) 35 cm
(ii) 4.2 cm​

Answer 1

Answer:

radius of semi circle (R) =35cm

radius is s mi circle (r) =4.2cm

(1) perimeyer of semi circle is πR

=22/7×35

=,110cm²

area of semi circle is πR²/2

=22/7×35×35×1/2

=1925cm²

(2) perimeter of semi circle is πr

=22/7×4.2

=17.2cm²

area of semi circle is πr²/2

=22/7×4.2×4.2×1/2

=36.12