The triangle shown has a base of 12 and a height of 3. What is its area?
A36
B18
C16
D30
Explanation
Area = ½ × base × height = ½ × 12 × 3 = 18.
Question 7 of 10
TEKS GEOEasy Diagram
The circle shown has a radius of 11. What is the area of the circle, in terms of π?
A22π
B242π
C11π
D121π
Explanation
Area = πr² = π(11)² = 121π. (Don't confuse with circumference 2πr.)
Question 8 of 10
TEKS GEOMedium Diagram
Triangle ABC is similar to triangle DEF, shown below. Side AB has length 8 and corresponds to side DE of length 40. If side BC has length 7, what is the length of side EF?
A35
B42
C15
D12
Explanation
Similar triangles have proportional sides. Scale factor = DE/AB = 40/8 = 5. So EF = BC × 5 = 7 × 5 = 35.
Question 9 of 10
TEKS PSDMedium
A jar contains 25 marbles. 11 of them are red and the rest are blue. If one marble is drawn at random, what is the probability it is red?
A14/25
B12/25
C11/14
D11/25
Explanation
P(red) = favorable / total = 11/25 = 11/25 in simplest form.
Question 10 of 10
TEKS ADVMedium
If f(x) = 6x² − 6x + 8, what is f(7)?
A8
B266
C254
D260
Explanation
f(7) = 6(7)² + (-6)(7) + 8 = 294 − 42 + 8 = 260.
Score
Correct
Wrong
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