Core geometry vocabulary and formulas covering shapes, angles, perimeter, area, and volume for middle school geometry.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What is an acute angle?
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An angle that measures less than 90 degrees.- What is a right angle?
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An angle that measures exactly 90 degrees.- What is an obtuse angle?
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An angle that measures between 90 and 180 degrees.- What are complementary angles?
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Two angles whose measures add up to 90 degrees.- What are supplementary angles?
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Two angles whose measures add up to 180 degrees.- What is the sum of all angles in a triangle?
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180 degrees.- What is the sum of all angles in a quadrilateral?
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360 degrees.- What is perimeter?
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The total distance around the outside of a shape.- What is the formula for the area of a rectangle?
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length times width, or A = l * w- What is the formula for the area of a triangle?
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A = (1/2) * base * height- What is the formula for the area of a circle?
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A = pi * r squared, or A = pi * r^2- What is the formula for the circumference of a circle?
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C = 2 * pi * r, or C = pi * d- What is the radius of a circle?
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The distance from the center to any point on the circle.- What is the diameter of a circle?
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The distance across the circle through its center.- State the Pythagorean theorem.
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In a right triangle, a squared plus b squared equals c squared, or a^2 + b^2 = c^2
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