Question

Kak Tolong Please... Semua Nya jangan sedikit2 ya.. :(

Answer 1

Semoga membantu. Maaf kalau salah atau kurang jelas gambarnya :)

Answer 2

4.) Luas trapesium
= ( a + b ) × t / 2
= ( 20 + 35 ) × 10 /2
= 55 × 5
= 275 cm

5.) r = 21
• luas
= πr²
= 22/7 . 21 . 21 .
= 1386 cm

• keliling
= 2πr
= 2 . 22/7 . 21
= 132 cm

6.)
• luas ¼ lingkaran
= ¼ . πr²
= ¼ . 22/7 . 21 . 21
= ¼ . 66 . 21
= ¼ . 1386
= 346,5 cm

• keliling
= 2r + kll ¼ lingkaran
= 2(21) + ¼ . 2πr
= 42 + ¼ . 2 . 22/7 . 21
= 42 + ¼ . 132
= 42 + 33
= 75 cm


7.)
• luas
= ⅓ πr²
= ¾ . 3,14 . 10 . 10
= ¾ . 314
= 3 . 78,5
= 235,5 cm

• keliling
= ¾ . 2πr
= ¾ . 2 . 3,14 . 10
= ¾ . 2 . 31,4
= ¾ . 62,8
= 47,1 cm