Flashcards · Maths · Geometry and Measures
Area, Perimeter and Circles
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What is the formula for the area of a rectangle?
\(A = l \times w\).
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What is the formula for the area of a triangle?
\(A = \dfrac{1}{2} \times b \times h\).
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What is the formula for the area of a parallelogram?
\(A = b \times h\), using the perpendicular height.
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What is the formula for the area of a trapezium?
\(A = \dfrac{1}{2}(a + b)h\).
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How do you find the area of a compound shape?
Split it into simple shapes and add, or subtract a missing piece from a larger shape.
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What is the circumference formula?
\(C = \pi d = 2\pi r\).
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What is the formula for the area of a circle?
\(A = \pi r^2\).
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What is the relationship between diameter and radius?
The diameter is twice the radius.
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What is the area of a circle with radius 5 cm, in terms of \(\pi\)?
\(25\pi\) cm\(^2\).
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What is the circumference of a circle with diameter 14 cm?
\(14\pi\) cm.
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What is an arc?
A part of the circumference of a circle.
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What is a chord?
A straight line joining two points on a circle.
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What is a tangent?
A line that touches a circle at exactly one point.
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What is the area of a semicircle?
\(\dfrac{1}{2}\pi r^2\).
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How do you find the area of a sector (Higher tier)?
\(\dfrac{\theta}{360} \times \pi r^2\).
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What is the perimeter of a sector (Higher tier)?
The arc length plus two radii.