Two-Dimensional Figures Review Answers

1. Answer :

Luas Persegi : s x s = 5 x 5 = 25 cm2

Keliling Persegi : 4 x s = 4 x 5 = 20 cm

2. Answer :

Luas Persegi Panjang : p x l = 10 x 5 = 50 cm2

Keliling Persegi Panjang : 2 x (10+5) = 2 x 15 = 30 cm

3. Answer :

Luas Segitiga : 1/2 x a x t = 1/2 x 10 x 7 = 5 x 7 = 35 cm2

Keliling Segitiga : 10 + 8 + 9 = 27 cm

4. Answer :

Luas Jajar Genjang : a x t = 10 x 8 = 80 cm2

Keliling Jajar Genjang : 2 x (10+12) = 2 x 22 = 44 cm

5. Answer :

Luas Trapesium : 1/2 x (a1 + a2) x tinggi = 1/2 x (10+12) x 10 = 11 x 10 = 110 cm2

Keliling Trapesium : 10 + 10 + 11 + 12 = 43 cm

6. Answer :

Luas Layang-layang : 1/2 x d1 x d2 = 1/2 x 20 x 10 = 10 x 10 = 100 cm2

Keliling Layang-layang : 2 x (a+b) = 2 x (6 + 22) = 2 x 28 = 56 cm

7. Answer :

Luas Belah Ketupat : 1/2 x d1 x d2 = 1/2 x 14 x 10 = 7 x 10 = 70 cm2

Keliling Belah Ketupat : 4 x s = 4 x 8 = 32 cm

8. Answer :

Luas Lingkaran : 22/7 x 7 pangkat 2 = 22/7 x 49 = 1078 : 7 = 154 cm2

Keliling Lingkaran : 22/7 x (7 + 7 = 14) = 22/7 x 14 = 308 : 7 = 44 cm