This math topic focuses on calculating the area of non-right triangles by relating them to the areas of surrounding rectangles. The method practiced involves finding the area of the rectangle first and then halving it to arrive at the area of the enclosed triangle. Each problem presents a visual representation of a rectangle with a triangle inside, prompting learners to apply the halving method to determine the triangle's area. The problems vary in complexity and provide multiple choice answers, enhancing understanding of area calculations in different geometrical contexts.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

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Area of a Non-Right Triangle - Concept Intro - From Rectangle Worksheet

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Math worksheet on 'Area of a Non-Right Triangle - Concept Intro - From Rectangle (Level 3)'. Part of a broader unit on 'Area Intro' Learn online: app.mobius.academy/math/units/area_intro/
1
An svg image showing a math problem
Find the area of the TRIANGLE by halving the area of the rectangle around it
a A LaTex expression showing 20\text{m} to the power of 2
b A LaTex expression showing 21\text{m} to the power of 2
c A LaTex expression showing 10.5\text{m} to the power of 2
d A LaTex expression showing 4.7\text{m} to the power of 2
2
An svg image showing a math problem
Find the area of the TRIANGLE by halving the area of the rectangle around it
a A LaTex expression showing 18\text{ft} to the power of 2
b A LaTex expression showing 2\text{ft} to the power of 2
c A LaTex expression showing 36\text{ft} to the power of 2
d A LaTex expression showing 24\text{ft} to the power of 2
3
An svg image showing a math problem
Find the area of the TRIANGLE by halving the area of the rectangle around it
a A LaTex expression showing 4.7\text{km} to the power of 2
b A LaTex expression showing 10.5\text{km} to the power of 2
c A LaTex expression showing 77\text{km} to the power of 2
d A LaTex expression showing 20\text{km} to the power of 2
e A LaTex expression showing 32\text{km} to the power of 2
4
An svg image showing a math problem
Find the area of the TRIANGLE by halving the area of the rectangle around it
a A LaTex expression showing 1.3\text{in} to the power of 2
b A LaTex expression showing 20\text{in} to the power of 2
c A LaTex expression showing 12\text{in} to the power of 2
d A LaTex expression showing 16\text{in} to the power of 2
5
An svg image showing a math problem
Find the area of the TRIANGLE by halving the area of the rectangle around it
a A LaTex expression showing 14\text{m} to the power of 2
b A LaTex expression showing 20\text{m} to the power of 2
c A LaTex expression showing 10.5\text{m} to the power of 2
d A LaTex expression showing 4.7\text{m} to the power of 2
6
An svg image showing a math problem
Find the area of the TRIANGLE by halving the area of the rectangle around it
a A LaTex expression showing 21\text{in} to the power of 2
b A LaTex expression showing 10.5\text{in} to the power of 2
c A LaTex expression showing 4.7\text{in} to the power of 2
d A LaTex expression showing 17.5\text{in} to the power of 2
e A LaTex expression showing 20\text{in} to the power of 2
7
An svg image showing a math problem
Find the area of the TRIANGLE by halving the area of the rectangle around it
a A LaTex expression showing 45\text{in} to the power of 2
b A LaTex expression showing 10.5\text{in} to the power of 2
c A LaTex expression showing 44\text{in} to the power of 2
d A LaTex expression showing 17.5\text{in} to the power of 2