Tolong jawab pertanyaan nomor 17 lengkap dengan jalannya ya :D
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Verified answer
La = π × r²78,5 = 3,14 × r²
r² = 78,5 ÷ 3,14
r = √25
r = 5 cm
s = √(r² + t²)
s = √(5² + 12²)
s = √(25 + 144)
s = √169
s = 13
Lp = πr² + πrs
= πr ( r + s )
= 3,14 × 5 × ( 5 + 13 )
= 15,7 × 18
= 282,6 cm²