The Tutoring Center, Torrance CA


Tutoring in Torrance, CA.


Geometry Help: Formulas to Remember

Math builds upon the knowledge you have gained before. Knowing the following geometry formulas will help you quickly solve problems as you advance through your math courses.

Rectangle Formulas

Area=lw l is the length and w is the width. Multiply them together to find the area of a rectangle. Perimeter=2l+2w Double the length of each side and add the results together to calculate the perimeter. Volume=lwh h is the height of the rectangle. Multiply length, width, and height to find the volume.


To find the area of a parallelogram, drop two right triangles to determine the heights and turn the parallelogram into a rectangle.

Triangle Formulas

Area=1/2(b*h) Think of a triangle as half of a rectangle, so you need to take half of the base time height. The base of the triangle is the length of a side. If you have a right triangle, the height is the length of the side with the 90 degree angle. If non-right triangle, drop a line from the apex of the triangle to the base. Isosceles triangles have two equal sides and two equal angles. If one of the angles is 90 degrees, the other two will be 45. The lengths of a right isosceles triangle are always x, x, x√2. The find the hypotenuse, simply multiply √2 by one of the sides. The side lengths of a right triangle with angles 30-60-90 can be found using the formula x, x√3, and 2x. The smallest side, x, is opposite the smallest angle, 30. The longest side, 2x, is opposite the largest angle, 90.

Cylinder Volume

  The volume of a cylinder is the area of the circle that makes up its end times the height of the cylinder.

For Tutoring in Torrance

If you would like additional help with math, or other academic subjects, contact The Tutoring Center in Torrance. We have one-to-one tutoring in math, reading, writing, and test preparation. Find out more from our website and call 310 530 5377 to schedule your free diagnostic assessment.


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