Area and Perimeter - Triangles

Find the area of the triangle:

• 15.6 m²

• 7.8 m²

• 15.6 m

• 7.8 m

Find the area of the triangle:

• 12.95 in²

• 25.9 in²

• 25.9 in

• 12.95 in

Find the area of the triangle:

• 23.8 in

• 23.8 in²

• 5.95 in²

• 11.9 in²

Find the area of the triangle:

• 5.85 yd

• 11.7 yd²

• 5.85 yd²

• 23.4 yd²

Find the area of the triangle:

• 30.4 ft²

• 15.2 ft²

• 14.2 ft²

• 7.6 ft²

Find the area of the triangle:

• 15 mi²

• 44 mi²

• 22 mi²

• 11 mi²

Find the area of the triangle:

• 9.4 ft

• 4.7 ft²

• 9.4 ft²

• 4.7 ft

Find the area of the triangle:

• 11.5 yd²

• 23 yd²

• 11.5 yd

• 23 yd

In the video, how did I describe the formula for the area of a triangle?

• Pray and punch a bunch of random numbers into your teal TI-84, hoping that you look like you know what you're doing.

• Choose any side, multiply it by the altitude perpendicular to that side, and divide by two.

• Only use the side that is parallel to the horizon, because the other two sides won't get you the same answer.

• The answer is always 3.14

What is the "Altitude" of a triangle?

• The length of a triangle's longest angle bisector. You find it in the vertex with the smallest angle. It always bisects the smallest angle and its opposite side.

• The distance from one vertex to another in an equilateral triangle.

• The likelihood of a triangle to sass you if you call it a funny name.

  Nvm... that would be the "attitude" of a triangle.

• A line segment drawn from a vertex of a triangle perpendicular to the opposite side (or its extension).

  AKA: The triangle's height