Can 15 meters, 16 meters and 17 meters form a triangle? What's the area?
The sum of the two sides is greater than the third side
Can form a triangle, using Helen's formula
p=(15+16+17)÷2=24 a=15 b=16 c=17
S=√[p(p-a)(p-b)(p-c)]
=√[24×(24-15)×(24-16)×(24-17)]
=√[24×9×8×7]
=√[3×8²×3²×7]
=24√21
A trapezoidal vegetable field is 240 meters long at the top and 380 meters long at the bottom, and 150 meters high. How many square meters is its area? How many hectares is it
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