Plane Geometry (Foundations)

Plane Geometry: core idea

• 1. A circle has radius $4$. Find its area in terms of $\pi$.

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• 2. Two vertical angles measure $x+10$ and $3x-30$. Find $x$.

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• 3. Find the area of a parallelogram with base $12$ and height $7$.

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• 4. A regular octagon has how many sides?

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• 5. A right angle is divided into angles of $35^\circ$ and $x^\circ$. Find $x$.

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• 6. A square's side doubles from $5$ to $10$. What is its new area?

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• 7. Find the circumference of a circle with diameter $14$ in terms of $\pi$.

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• 8. A triangle has base $18$ and area $63$. Find its height.

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• 9. What is the sum of interior angles of a quadrilateral?

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