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Questions (14)
ABC is an isosceles triangle with AB = BC. The circumcircle of ABC has radius 8. Given further that AC is a diameter of the
2 answers
578 views
The waterfall "Angel Falls" in Venezuela is the world's tallest at h=979 m. Assume that the water's velocity on the top of the
0 answers
627 views
A few years ago, a movie came out about a soldier, John Carter, who was transported to Mars and could perform amazing feats of
1 answer
447 views
In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds
1 answer
522 views
Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be
0 answers
501 views
If a and b are coprime positive integers such that
1/2+1/3+1/4+1/5=ab, what is the value of a+b?
1 answer
494 views
The waterfall "Angel Falls" in Venezuela is the world's tallest at h=979 m. Assume that the water's velocity on the top of the
0 answers
646 views
A few years ago, a movie came out about a soldier, John Carter, who was transported to Mars and could perform amazing feats of
1 answer
477 views
When the distance between the hole and floor is h1=20 cm, the images's length is l1=20 cm; when the distance between the hole
0 answers
366 views
What is the value of 321 rounded up to the nearest 10?
4 answers
2,707 views
A group of friends are planning a road trip. If they all contributed $24, then they would be $6 short of the total. If they all
1 answer
490 views
Let O be the center of the circle Γ, and P be a point outside of circle Γ. PA is tangential to Γ at A, and PO intersects Γ
1 answer
542 views
x is a number such that x2+3x+9=0. What is the value of x3?
1 answer
366 views
In the English alphabet, there are 7 capital letters that look the same after being rotated 180∘. Those letters are H, I, N,
4 answers
5,738 views
