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Materi : Segitiga
Sub Materi : Besar Sudut
————————————————————
∠CAB = 30⁰ ...
∠BCA = 180⁰ ⁻ ∠BCD
∠BCA = 180⁰ ⁻ 60⁰
∠BCA = 120⁰ ...
∠ABC = 180⁰ ⁻ ∠BCA ⁻ ∠CAB
∠ABC = 180⁰ ⁻ 120⁰ - 30⁰
∠ABC = 30⁰ ...
Sudah sangat jelas, ΔABC merupakan Δ ( Segitiga ) Tumpul ...
Semoga bermanfaat ......
-Prisco