64-35= 29
so there were 29 boys included in the survey
Answer:
83
Step-by-step explanation:
100-80 ÷ 4 + (6-3)=100-20+3=80+3=83
1) find the are of the circle: πr²
2) find the area of each triangle: (base x altitude)/2
3) subtract the triangles from the circle are
1) area of circle:π.5² = 25 π
2) Area of the triangle = (6 x 4)/2 =12 cm². We also notice that both triangles are congruent SSS (6,5 & 5), so the total surface of the 2 triangles = 24 cm²
3) (25π - 24) cm² is the answer
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