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Penjelasan dengan langkah-langkah:
10.
[tex]L_{} = 170 {cm}^{2} \\ \frac{1}{2} \times d_{1} \times d_{2} = 170 \\ 20(2k + 1) = 170 \times 2 \\ 40k + 20 = 340 \\ 40k = 340 - 20 \\ 40k = 320 \\ k = 8 \\ \\ d_{2} =2k + 1 \\ d_{2} =2(8) + 1 \\ d_{2} =17cm[/tex]
12a.
∠BEA = ∠BEC = ∠AED = ∠CED = 90°
∠BAC = ∠BCA = 35°
∠ADB = CDB = 30°
∠CAD = ACD = 180°-90°-30° = 60°
∠ABD = ∠CBD = 180°-90°-35° = 55°
∠ABC = ∠ABD + ∠CBD = 55°+55° = 110°
∠ADC = ∠ADB + ∠CDB = 30°+30° = 60°
∠BAD = ∠BCD = ∠BAC + ∠CAD = 35°+60° = 95°
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