Penjelasan dengan langkah-langkah:

1) K = 2 ( p+l ) = 2 (8cm + 7cm) = 2x15cm

= 30 cm

2) K = 4x r = 4 x 50cm = 200 cm

3) P = (75cm-33cm) ÷ 2

= 42 cm ÷ 2

= 21 cm

4) K = 4 x r = 4 x 23cm = 92 cm

5) K = 2p + 2.l

120cm = 2p + 2x25cm

120cm = 2p + 50cm

2p = 120cm - 50cm

2p = 70 cm

p = 70cm ÷ 2

p = 35 cm

6) 15 x 15 = 225

7) 30x30 ÷ 5x5 + 18x18 = 900 ÷ 25 + 324

= 360

8) √256 = 16

9) √144 +√25+4 = 12 + 5 + 2 = 19

10) Luas = r x r = 12cm x 12cm = 144 cm2

11) L = 1/2 x a x t

84cm = 1/2 x a x 7cm

84cmx 2 = 7a

7a = 168 cm

a = 168 cm ÷ 7

a = 24 cm

panjang AB = 24 cm

12) L∆ = 1/2 x 6 x 15 = 45cm

L persegi = 15x 15 = 225cm

Luas bangun = 225cm + 45cm

= 270 cm

13) L = px l

p = L ÷ l = 120cm ÷ 8cm= 15cm

K = 2 (p+l) = 2 ( 15+8) = 2x23= 46cm

14) L bangun = 8 x l persegi

128 cm2 = 8 x l persegi

l persegi kcl = 128 ÷ 8

l persegi kcl = 16 cm2

l persegi kcl = r x r

r persegi kecil = √16cm2

r persegikecil = 4cm

K persegi kecil = 4 x r

= 4 x 4 cm

= 16 cm

15) L ∆ = 1/2 x a x t

357 cm2 = 1/2 x a x 17cm

357 x2 = 17 a

17 a = 714 cm

a = 714 cm ÷ 17

alas = 42 cm

B.

1) K lapangan = 2 ( 30m+15m )

= 2 x 45 m

= 90 m

Jarak yg ditempuh Mita jika berlari 2 x keliling lapangan = 2 x 90 m = 180 m