You can use the Pythagorean relationship to know if a triangle is right triangle or not. The "a" and "b" on a right triangle represents the legs. The "c" is called the hypotenuse. If you add both side lengths of a and b you will get the hypotenuse. You can also determine a missing side length using one of this formulas
a²= c² - b²
b²= c² - a²
c²= a² +b²
2. Solve for the missing side length.
c²= a² +b²
c²= 12cm+5cm
c²= (12x12)+(5x5)
c²= 144cm²+25cm²
c²= 169cm²
√ c² = 169cm²
√ c = 13cm
3. Is this a right triangle? Prove it!!!
YES!
c²= a² +b²
c²= 8cm+6cm
c²= (8x8)+(6x6)
c²= 64cm²+36cm²
c²= 100cm²
√ c² = 100cm²
√ c = 10cm
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