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The face of the gate of a dam is in the shape of an isosceles triangle 4 m wide at the top and 3 m

The face of the gate of a dam is in the shape of an isosceles triangle 4 m wide at the top and 3 m high. If the upper edge of the face of the gate is 15 m below the surface of the water, find the total force due to water pressure on the gate. The answer is 942,000 but how do you get it using integration?

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