Question

Lesson 15 Practice Problems

1. jada drew a net for a polyhedron and calculated its surface area.
5
20 sq cm
5
10
5
12 sq cm
4
16 sq cm
4
12 sq cm
5
3
3
3
12 sq cm
3
4

Answer 1

Explanation:

Here, the region of the triangle with a base 4 cm and a level 3 cm.

That is, the region of a triangle=

1/2 × Base × Level

=1/2 × 4 × 3

=6 sq cm

The region of a square shape with a length 5 cm and a breadth 4 cm

The region of a square shape = Length × breadth

=5 × 4 =20 sq cm

The region of a square shape with a length 4 cm and a width 3 cm

=4 × 3 =12 sq cm

The region of a square with the side 4 cm.

The region of a square = side²=4²=16 sq cm

The absolute surface of the given polyhedron =6 + 6 + 20 + 12 + 16

=60 sq cm

From the above estimation, it is distinguished as a region of the triangle that is determined incorrectly.