A scalene triangle has 3 sides of different lengths and 3 unequal angles. An isosceles triangle has 2 sides of equal length. The dashes on the lines show they are equal in length. The angles at ...

A rectangle has four right angles. The diagonals are equal and split a rectangle into four isosceles triangles. The diagonals do not meet at right angles. Since each corner of a rectangle is 90 ...