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How many degrees in a triangle?
The sum of angles in any triangle is 180°. view more
Geometry
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What is the area of a circle?
Area = πr² (pi times radius squared) Example: Circle with radius 5 Area = π × 5² = 25π ≈ 78.54 square units Remember: Use radius (half of diameter), not diameter. view more
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What is pi (π)?
π ≈ 3.14159 Pi is the ratio of a circle's circumference to its diameter. view more
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What is the Pythagorean theorem?
a² + b² = c² Where: - a and b are the legs (shorter sides) - c is the hypotenuse (longest side, opposite right angle) Example (3-4-5 triangle): 3² + 4² = 9 + 16 = 25 = 5² view more
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What is the area of a triangle?
Area = ½ × base × height The height must be perpendicular to the base. view more
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What is the circumference of a circle?
Circumference = 2πr (or πd) Where: - r = radius - d = diameter Example: Circle with radius 7 C = 2 × π × 7 = 14π ≈ 43.98 units view more
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What is the volume of a sphere?
Volume = (4/3)πr³ Example: Sphere with radius 3 V = (4/3) × π × 27 = 36π ≈ 113.1 cubic units view more