60% of the marching band are girls. There are 30 girls in the band how many students all together?
1 answer:
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Answer:
x = y²
Step-by-step explanation:
Given
x = and y =
Note that
x = =
×
= y²
Thus x = y²
Answer:
The first one. 4 times square root of 3.
Step-by-step explanation:
The side of the equilateral triangle that represents the height of the triangle will have a length of because it will be opposite the 60o angle. To calculate the area of the triangle, multiply the base (one side of the equilateral triangle) and the height (the perpendicular bisector) and divide by two.
Triangle ABC and triangle DCE are congruent, so line DE = line AB
Use the cosine rule to find angle ACB
Angle ACB = 48.1°
Use the cosine rule to find angle ACB
Angle ACB = 48.1°