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Step-by-step explanation:

1.

2. is the slope

    is the y-intercept

3. For a triangle, you multiply base by height and divide by 2

   For a parallelogram, you multiply base by height.

4. 30 centimeters

   300 millimeters

5.

   or

  depending on what you were taught

6.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

your answer is a

step-by-step explanation:

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