tolong bantu di kasih cara plizzz
29. D
30. D
41. 4 : 9
Penjelasan dengan langkah-langkah:
29. x = 70°
y = 180 - 130
= 50°
x + y = 70° + 50° = 120°
30. skala 1 : 1000
1 cm = 1000 cm
= 10 m
p = 3,5 cm = 3,5 x 10 m = 35 m
l = 2,2 cm = 2,2 x 10 m = 22 m
L = p x l
= 35 m x 22 m
= 770 m²
31. (R + r)² = 13² - 12²
(3 + r)² = 169 - 144
= 25
3 + r = √25
= 5
r = 5 - 3 = 2 cm
L.p : L.o = r² : R²
= 2² : 3²
= 4 : 9
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