Question

For a project, you need to make three triangles out of cardboard. Each triangle has a height of 5 inches and a base of 10 inches. Which equation can you use to solve for the total amount of cardboard you will need?

Answer 1

Answer:

Option 1st is correct

$3 \cdot (\frac{1}{2} \cdot 10 \cdot 5)=x$

Step-by-step explanation:

Area of the triangle is given by:

$A = \frac{1}{2}bh$

where,

A is the area of the triangle

b is the base and

h is the height of the triangle.

As per the statement:

For a project, you need to make three triangles out of cardboard.

Each triangle has a height of 5 inches and a base of 10 inches

⇒b = 10 inches and h = 5 inches

$\text{Area of each triangle} = \frac{1}{2} \cdot 10 \cdot 5$

Since,  you need to make three triangles out of cardboard

⇒$\text{Area of 3 triangle}(x) =3 \cdot (\frac{1}{2} \cdot 10 \cdot 5)$

Therefore, an equation can you use to solve for the total amount of cardboard you will need is,

$3 \cdot (\frac{1}{2} \cdot 10 \cdot 5)=x$