pleas di jawab guys untuk pr

d² = p² - (R+r)²
16² = 34² - (3/2 b + b)²
256 = 1156 - (5/2 b)²
(5/2b)² = 1156 - 256
(5/2b)² = 900
5/2b = 30
5/2 b = 30
b = 30 . 2/5
b = 12

A = 3/2 b 
= 3/2 x 12
= 18 cm

Semoga Membantu