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Since these sides are in the ratio 3 to 4 and angle C is 90) the triangle is a 345 triangle Therefore, side AB represents the 5unit side of the triangle The ratio 30 to 40 to 50 is equivalent to 345, and thus side AB is 50 units long Practice problems Without reference to tables or to the rule of Pythagoras, solve the followingEvery side of the triangle can be a base;A triangle cannot have a measurement or value of all the angles less than 60° A triangle is a 3sided closed shape There are two important formulas related to triangles, ie, Herons formula and Pythagoras theorem The sum of the angles of a triangle adds up to 180° and given as ∠1 ∠2 ∠3 = 180° ☛Related Articles on Triangles 30 60 90 Triangle Formulas Rules And Sides Science Trends Right triangle with sides 3 4 5 angles