Chapter 2. Area of Shapes

Pre-Test Question:

Math and Graphing Review
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You must read each slide, and complete any questions on the slide, in sequence.

Question

Determine the area of the shaded region labeled A in the figure below:

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Correct! The area of region A is 5.
To determine the area, try dividing the region up into a rectangle and a triangle, and then calculate each area separately. The area of the rectangle is 4 and the area of the triangle is 1.

Video

Post-Test Questions:

Question 2.1

Determine the area of the shaded region labeled A in the figure below:

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Correct! The area of region A is 300.
The area of the triangle region A is 0.5 × height × base, or 0.5 × 15 × 40 = 300.

Question 2.2

Determine the area of the shaded region labeled A in the figure below:

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Correct! The area of region A is 8.
To determine the area try dividing the region up into a rectangle and a triangle, then calculate each area separately. The area of the rectangle is 6 and the area of the triangle is 2.

Question 2.3

Determine the area of the shaded region labeled A in the figure below:

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Correct! The area of region A is 4.
The area of triangle region A is 0.5 × height × base, or 0.5 × 2 × 4 = 4.

Question 2.4

Determine the area of the shaded region labeled A in the figure below:

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Correct! The area of region A is 4.
The area of triangle region A is 0.5 × height × base, or 0.5 × 2 × 4 = 4.

Question 2.5

Determine the area of the shaded region labeled A in the figure below:

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Correct! The area of region A is 10,000.
The area of triangle region A is 0.5 × height × base, or 0.5 × 50 × 400 = 10,000.