Giovanni said that since the sum of the measures of the angles of triangle is 180, the angles of a triangle are supplementary. Do you agree with Giovanni?

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.