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<em>Correction to your question text: diameter, not radius.</em>
The area of a circle is given by:

The radius is half of the diameter.

Substitute and solve.

Answer: the answers 190
Step-by-step explanation:
Answer:
Ummm ok?
Step-by-step explanation:
Where’s the question?
Answer:
31.5 units²
Step-by-step explanation:
Area = ½*base*height
Height of the triangle on the grid = 9 units
Base = 7 units
Area = ½*9*7
Area = ½*63
Area = 63/2
Area = 31.5 units²