The two lower base angles are 30 and 60 degrees. the sine and cosine of 30° to find out the others sides lengths:Īlso, if you know two sides of the triangle, you can find the third one from the Pythagorean theorem. A 30-60-90 triangle is a special right triangle (a right triangle being any triangle that contains a 90 degree angle) that always has degree angles. the parallel sides of a trapezoid have lengths 7 cm and 15 cm. 30 60 90 and 45 45 90 Triangles Calculator for these 2 types of special. If you are familiar with the trigonometric basics, you can use, e.g. We have a special right triangle calculator to calculate this type of triangle. It's equal to side times a square root of 3, divided by 2: Using the properties of the equilateral triangleĭid you notice that our triangle of interest is simply a half of the equilateral triangle? If you remember the formula for the height of such a regular triangle, you have the answer what's the second leg length.Thus, the formula to calculate the hypotenuse c is. The formulas are quite easy, but what's the math behind them? Let's check which methods you can use to prove them: In a 30 60 90 special right triangle the hypotenuse is always equal to twice the length of the shortest leg.
#Special right triangles 30 60 90 calculator how to#
How to solve a 30 60 90 triangle? 30 60 90 triangle formulaĪssume that the shorter leg of a 30 60 90 triangle is equal to a.
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