Question

Tolong di jawab ya...PLEASE aku lagi butuh banget nie...pakai caranya juga ya

Answer 1

Verified answer

21 =
# luas 1 segitiga =
4 x (28-12)
---------------
2
= 2 x 16 = 32 cm² x 2 = 64 cm²
#luas persegi panjang = p x l = 28 x 14 = 392 cm²
>>luas bangun = 392 + 64 = 456 cm² (d)

22 =
# 1/2 lingkaran besar =
1/2 x 314/100 x 20 x 20
1/2 x 314/1 x 2 x 2
314 x 2 x 2
-----------------
2
= 314 x 2 = 628 cm²

# 1 lingkaran kecil =
314/100 x 10 x 10 = 314 cm²
>>luas daerah arsir = 628 - 314 = 314 cm ² (a)

#okeguystujwbnnya

Answer 2

21) trapesium =(4cm+4cm)+14cm
+14cm×(28cm-12cm):2
=[8cm+14cm+14cm]×16cm:2
=36cm ×16cm:2
=576cm2:2=288cm2

persegi panjang =14cm×12cm
=168cm2
jumlah=288cm2+168cm2
=456cm2

22) 1/2×3,14×20cm×20cm=1/2× 1.256cm2
=628cm2
3,14×10cm×10cm =314cm2

selisih=628cm2-314cm2
=314cm2