Answer:
Step-by-step explanation:
A = π r²
A = 11²π - 3²π = ( 121 - 9 ) π = 112 π ≈ 112 × = 352 cm²
( 112 × 3.14 = 351.68 cm²)
Evaluate the following expression when x = 3 and y = 4: 2x + y2 - 1
2 answers:
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Given:
The diagram of triangle DEF and triangle D'E'F' on a coordinate plan.
To find:
The algebraic representation of the dilation.
Solution:
The vertices of triangle DEF are D(0,7), E(7,-7) and F(-7,-7).
The vertices of triangle D'E'F' are D'(0,2), E(2,-2) and F(-2,-2).
We know that, the dilation factor is:
For point D' the y-coordinate is 7 and for point D the y-coordinate is 2. So,
The rule of dilation is:
The algebraic representation of the dilation is .
Therefore, the correct option is b.