Bntu yaa please 1) 2) 3) 4) 5)

1.
r = 28, d = 56

K = 22/7 × 56
K = 176

lintasan = 176 × 400
lintasan = 70400 cm = 704 m

2.
Luas juring = 90/360 × 22/7 × 21 × 21
Lj = ¼ × 22 × 3 × 21
Lj = 346,5

L∆ = ½ × 21 × 21
L∆ = 220,5

L arsir = 346,5 - 220,5 = 126 cm²

3.
a.
150/40 = x/24
40x = 150 × 24
x = 3600/40
x = CD = 90 cm

b.
150/40 = 60/x
150x = 40 × 60
x = 2400/150
x = L AOB = 16 cm²

4.
a.
1256 = 3,14 × r²
r² = 1256/3,14
r² = 400
r = √400 = 20 cm

b.
d = 40

K = 3,14 × 40 = 125,6 cm

c.
busur = 70/360 × 3,14 × 40
b = 8792/360
b = 24,42 cm

juring = 70/360 × 3,14 × 20 × 20
j = 87920/360
j = 244,22 cm²

5.
a.
<QPR = 70/2 = 35°
<QSR = <QPR = 35°

semoga membantu :))