Geometry Tutor - Basic Geometry

Geometry Tutor - Basic Geometry Square: Perimeter = 4s Area = s2 Rectangle: Perimeter = 2 (l + w) Area = l (x) w Triangle: Perimeter = a + b + c Area = 1/2 x b x h Sum of all the angles in a triangle = 180 Types of triangles: Right angled triangle Right angle Hypotenuse theorem a + b = c Area = 12 ab Here a is the base and b is the height Isosceles triangle Two sides of a triangle are equal. Two angles of a triangle are equal. Equilateral triangle All sides of the triangle are equal Each angle of the triangle are 60. Scalene triangle (No sides are equal) No two sides are equal in scalene triangle. Rectangular solid: Volume = l x w x h Surface Area = 2 ( lw + wh + lh) Cone: Volume = 3 r h Surface Area = r Sphere: Volume = 4/3 r Surface Area = 4r Example: If a square has an Area of 81 m. Find the perimeter of the square. Answer: Area = s = 81 s = 81 s = 9 m Perimeter of square = 4s = 4 x 9 = 36 m