Answer:
To calculate the diameter of a circle, multiply the radius by 2. If you don't have the radius, divide the circumference of the circle by π to get the diameter. If you don't have the radius or the circumference, divide the area of the circle by π and then find that number's square root to get the radius.
Step-by-step explanation:
Answer:
(x^2)-4
Step-by-step explanation:
expand using the distributive property of multiplication
Option C: 
Solution:
Given equation is 
.
This is a quadratic equation.
Here a = 1, b = 6, c = 7
To solve the given equation by quadratic formula,
Substitute the given values in the quadratic formula, we get
2 in the numerator and denominator are cancelled.
Option C is the correct answer.
Answer:
Use the cosine rule
Step-by-step explanation:
1. Apply formula of c^2 = a^2 + b^2 - 2abcosC
2. Substitute known values in: c^2 = 36 + 4900 - 840cos120
3. Apply algebra and use the calculator
4. Final answer is 73.18 (2 decimal places)
