If: 8x+12x = 90
Then: 20x = 90
And: x = 4.5
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A right angled triangle can only have two acute angles.
The sum of two acute angles of a right triangle must equal 90 degrees.
A right triangle is a triangle with one of its angles being 90o. The requirements for the other two angles are that they both be acute and total to 90o. Therefore, the largest possible acute angle in a right triangle is 89.99999...o.
The three kinds of triangles are:right triangle :one of the angles is a right angle (i.e. measures 90 degrees)acute: All of the angles measures less than 90 degrees. A special case of acute isthe equiangular or equilateral triangle in which all angles measure 60 degrees;obtuse: One of the angles measure more than 90 degrees.
A right angle triangle has 2 acute angles that add up to 90 degrees, along with 1 right angle of 90 degrees.