K = 2(p + l)
76 = 2(20 + l)
76/2 = 20 + l
38 = 20 + l
l = 38 - 20
l = 18 cm
<A + <B + <C = 180°
50° + 90° + <C = 180°
140° + <C = 180°
<C = 180° - 140°
<C = 40°
Penjelasan dengan langkah-langkah:
20. Dik: p = 20 cm
k = 76 cm
Dit: l = ...?
Jwb: K = 2p + 2l
76 = 2×20 + 2l
76 = 40 + 2l
2l = 76 - 40
2l = 36
l = 36 ÷ 2
21. Dik: < a = 50°
Dit: < b dan < c
Jwb: < total segitiga = 180°
< b = 90 ° (karena segitiga tersebut merupakan segitiga siku siku)
Maka, < c = < total - (< a + <b)
= 180° - (50° + 90°)
= 180° - 140°
= 40°
maka < b = 90° dan < c = 40°
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[Nomor 20]
K = 2(p + l)
76 = 2(20 + l)
76/2 = 20 + l
38 = 20 + l
l = 38 - 20
l = 18 cm
[Nomor 21]
<A + <B + <C = 180°
50° + 90° + <C = 180°
140° + <C = 180°
<C = 180° - 140°
<C = 40°
Penjelasan dengan langkah-langkah:
20. Dik: p = 20 cm
k = 76 cm
Dit: l = ...?
Jwb: K = 2p + 2l
76 = 2×20 + 2l
76 = 40 + 2l
2l = 76 - 40
2l = 36
l = 36 ÷ 2
l = 18 cm
21. Dik: < a = 50°
Dit: < b dan < c
Jwb: < total segitiga = 180°
< b = 90 ° (karena segitiga tersebut merupakan segitiga siku siku)
Maka, < c = < total - (< a + <b)
= 180° - (50° + 90°)
= 180° - 140°
= 40°
maka < b = 90° dan < c = 40°