Fundamental geometry definitions, angle properties, and essential formulas for area, volume, and the Pythagorean theorem.
What is the Pythagorean theorem
a² + b² = c², where c is the hypotenuse
What is the area of a circle
A = πr², where r is the radius
What is the sum of interior angles in a triangle
180 degrees
What is an angle called if it is exactly 90 degrees
A right angle
What is the formula for the circumference of a circle
C = 2πr, or C = πd
What is an angle less than 90 degrees called
An acute angle
What is the area of a triangle
A = (base × height) / 2
What is the sum of interior angles in any quadrilateral
360 degrees
What is the formula for the area of a rectangle
A = length × width
What is an angle greater than 90 but less than 180 degrees
An obtuse angle
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