Question

Tolong di jawab pakai cara ya plis!

Answer 1

23) L=3/4 .πr²

=3/4 . 22/7 . 28²

=3/4 . 2464

=1848 cm²

21)L1 + l2

=s . s + (a+b)/2 . t

=7 . 7 + (7+12)/2 . 8

=49 + 76

=125 cm²

22)L1 + l2

=s . s + 2πr²

=42 . 42 + 2 . 22/7 . 21²

=1764 +2772

=4536 cm²

Answer 2

21. L persegi = 7 × 7 = 49 cm2      L trapesium = (7 + 12) × 8 : 2 = 76 cm2      L gabungan = 49 cm2 + 76 cm2 = 125 cm2 22. L persegi = 42 × 42 = 1764 cm2        L lingkaran = 2 × 22/7 × 21 × 21 = 2772 cm2       L gabungan = 1764 + 2772 = 4.536 cm2 23. L = 3/4 × 22/7 x 28 x 28 = 1848 cm2