Tolong dibantu ya trman²​

Penjelasan dengan langkah-langkah:

3. Larsir = 1/2 × ( a + b ) × t

= 1/2 × ( 14 + 26 ) × 12

= 1/2 × 40 × 12

= 20 × 12

= 240 cm² ✔

Lt.arsir = 1/2 . phi . r²

= 1/2 . 3,14 . 4 . 4

= 3,14 . 8

= 25,12 cm²

Larsir – Lt.arsir = 240 cm² – 25,12 cm²

= 214,88 cm²

4. L = 1/2 × d1 × d2

= 1/2 × 12 × 6

= 36 cm²

5. Ljuring = a/360 . phi . r²

77 = 45/360 . 22/7 . r²

77 = 1/8 . 22/7 . r²

77 = 22/56 . r²

77 . 56/22 = r²

4312/22 = r²

r² = 196

r = akar 196

r = 14 cm

K = 2 . phi . r

= 2 . 22/7 . 14

= 2 . 22 . 2

= 88 cm

Pbusur = a/360 . K

= 45/360 . 88 cm

= 1/8 . 88 cm

= 11 cm