ProblemA=12bh, b=10, h=6A = \tfrac{1}{2} b h,\ b=10,\ h=6A=21bh, b=10, h=6Step-by-step solution套用公式:A=12⋅base⋅heightA = \tfrac{1}{2} \cdot \text{base} \cdot \text{height}A=21⋅base⋅height。代入 b=10b = 10b=10、h=6h = 6h=6:A=12⋅10⋅6A = \tfrac{1}{2} \cdot 10 \cdot 6A=21⋅10⋅6。化簡:A=30A = 30A=30。注意:高必須與所選底邊 垂直 — 而不是斜邊的長度。AnswerA=30A = 30A=30Want to solve a different problem? Open the area solver →Related worked examples/solve/geometry/area-rectangle-5-by-8/solve/geometry/area-circle-radius-7