Jawab:27a 5928c 35°29c 125°30b 82
Penjelasan dengan langkah-langkah:
(27). sudut berpelurus ditmbah = 180°57+2x+5 = 180 ∴ 62+2x=180 ∴ 2x=180-622x = 118 ∴ x = 118/2 ∴ x = 59 (opsi a)
(28.) sudut berpenyiku ditambah = 90°3x-5+x+15 = 90 ∴ 4x=90+5-15 ∴ 4x=80x = 80/4 ∴ x = 20 <RQS = x+15 = 20+15 = 35°(opsi c)
(29.) <aod + <boc = 110°<doc = 180 - (<aod/2) = 180-(110/2) = 180-55= 125° (opsi c)
(30.) 3x-42=2x+7 ∴ 3x-2x=7+42 ∴ x = 493x-42+y+42 = 180 ∴ 3(49)+y=180 ∴ 147+y = 180 ∴ y = 180-147 ∴ y = 33x + y = 49 + 33 = 82 (opsi b)
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Jawab:
27a 59
28c 35°
29c 125°
30b 82
Penjelasan dengan langkah-langkah:
(27). sudut berpelurus ditmbah = 180°
57+2x+5 = 180 ∴ 62+2x=180 ∴ 2x=180-62
2x = 118 ∴ x = 118/2 ∴ x = 59 (opsi a)
(28.) sudut berpenyiku ditambah = 90°
3x-5+x+15 = 90 ∴ 4x=90+5-15 ∴ 4x=80
x = 80/4 ∴ x = 20 <RQS = x+15 = 20+15 = 35°
(opsi c)
(29.) <aod + <boc = 110°
<doc = 180 - (<aod/2) = 180-(110/2) = 180-55
= 125° (opsi c)
(30.) 3x-42=2x+7 ∴ 3x-2x=7+42 ∴ x = 49
3x-42+y+42 = 180 ∴ 3(49)+y=180 ∴
147+y = 180 ∴ y = 180-147 ∴ y = 33
x + y = 49 + 33 = 82 (opsi b)
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