Find the Area of Right Triangles

Review why a triangle is half of a parallelogram before students start. Ask them to write the formula with the numbers in place for each triangle, then check units.

Find the area of 6 right triangles from their legs, such as 7 in and 5 in, writing halves as decimals. The legs of a right triangle meet at the right angle. Its area is A = 1 2 × a × b. The directions on the page read: Find the area of each right triangle. Write halves as decimals. An answer key is included.

Yes, both. We made it for 6th Grade geometry, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with area of triangles. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

Two copies of the same triangle fit together to make a parallelogram with the same base and height. The parallelogram's area is b × h, so one triangle is half of that.

The two legs meet at the right angle, so one leg is the base and the other is the height. A right triangle with legs of 12 cm and 8 cm has an area of 1/2 × 12 × 8 = 48 square cm.

Yes. Both area of triangles sheets have an answer key.