Penjelasan dengan langkah-langkah:
∆ KMN sama kaki
∠NMK = (180º - 120º)/2
∠NMK = 30º
∆ KML
∠KML = 150º - ∠NMK
∠KML = 150º - 30º
∠KML = 120º
.
KM² = KN² + NM² - 2(KN x NM) cos120º
KM² = 3² + 3² - 2(3 x 3) cos(-60)
KM² = 9 + 9 + (2 x 9) x 1/2
KM² = 18 + 9 = 27
KM = 3√3
KL² = KM² + ML² - 2(KM x ML) cos∠KML
KL² = (3√3)² + (3√2)² - 2(3√3 x 3√2) cos120º
KL² = 27 + 18 - 2(9√6) x cos(-60)
KL² = 45 + 9√6
KL² = 9(5 + √6)
KL = 3√(5 + √6)
keliling segi empat KLMN
= 3 + 3 + 3√2 + 3√(5+ √6)
= (6 + 3√2) + 3√(5 + √6)
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Penjelasan dengan langkah-langkah:
∆ KMN sama kaki
∠NMK = (180º - 120º)/2
∠NMK = 30º
∆ KML
∠KML = 150º - ∠NMK
∠KML = 150º - 30º
∠KML = 120º
.
KM² = KN² + NM² - 2(KN x NM) cos120º
KM² = 3² + 3² - 2(3 x 3) cos(-60)
KM² = 9 + 9 + (2 x 9) x 1/2
KM² = 18 + 9 = 27
KM = 3√3
.
KL² = KM² + ML² - 2(KM x ML) cos∠KML
KL² = (3√3)² + (3√2)² - 2(3√3 x 3√2) cos120º
KL² = 27 + 18 - 2(9√6) x cos(-60)
KL² = 45 + 9√6
KL² = 9(5 + √6)
KL = 3√(5 + √6)
.
keliling segi empat KLMN
= 3 + 3 + 3√2 + 3√(5+ √6)
= (6 + 3√2) + 3√(5 + √6)