The area of a triangle is found by multiplying the height of the triangle by the length of the base and dividing them both by 2. The length of the shorter side in the equation is useless information, so just multiply 39 by 25 and divide that by 2. A=487.5 sq ft. Also, that's a pretty big kite.
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90degrees I'm pretty sure
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The relationship between acceleration and time relates to the velocity and how it changes throughout the movement of an object.
The force needed to accelerate a vehicle with a mass of 1000kg at a rate of 5m/s2 would be 5000