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Find the volume and surface area of a sphere or radius 8.4 cm.

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The ratio of the areas of two triangles with the common base is 4:3. Height of the larger triangle is 2 cm, then finds the corresponding height of the smaller triangle.

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Two buildings are in front of each other on either side of a road of width 10 meters. From the top of the first building which is 20 meters high, the angle of elevation to the top of the second is 45^owhat is the height of the second building?

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Prove that “the opposite angles of a cyclic quadrilateral are supplementary”

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Prove that sin⁶θ + cos⁶ θ = 1-3 sin² θ. Cos² θ