Đáp án:
Giải thích các bước giải:
Độ dài đường chéo lớn hơn là:
(84+18):2=51mĐộ dài đường chéo nhỏ hơn là:
84-51=33m
Diện tích hình thoi là: 51x33:2=841,5m2
Đường chéo thứ nhất dài:
`\frac{(84+18)}{2}=51` (m)
Đường chéo thứ hai dài:
`84-51=33` (m)
Diện tích hình thoi là:
`\frac{51×33}{2}=841,5` (m²)
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