1. AB is a tangent line to the circle C at point B
∴ AB⊥BC
∴ Δ ABC is a right triangle , ∠B = 90°
∴ AC² = AB² + BC²
BC = radius = 4,000
AC = 4,000 + 22,000 = 26,000
∴ AC² = AB² + BC² = 4,000² + 26,000² = 692 * 10^6
∴ AC = √( 692 * 10^6 ) ≈ 26,306 mi
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2. <span>∠BAC = 9°
</span>
<span> Δ ABC is a right triangle , ∠B = 90°</span>
<span> ∠CBA = 90°
</span>
∴ ∠BCA = 180° - (90° + 9°) = 81°
∴ the measure of arc BD which facing the <span>satellite = 2 * 81° = 162°
</span>
while the total angel of the circle = 360°
∴ <span>The percent of the Earth’s equator which is within range of the satellite’s signal = 162/360 = 0.45 = 45%
</span>
Answer:
Easy!
Step-by-step explanation:
EDIT: Don't mind this, look down at the comments if you want the answer.
Answer:
21a
Step-by-step explanation:
yes they are equal.. all you need is just to add all the number to get your answer!
Answer:
The addition property of equality
Step-by-step explanation:
2 + 8 = 10
10 = 10
