Math Is Fun Forum

how would you prove that? by induction?

i found this bobbym on brilliant leaderboards

can you do 3?

i appreciate your help

thanks, i got both of them.

Let ABCD be a square, and let M and N be the midpoints of

and

, respectively. Find

.

Triangle ABC has side lengths AB = 9, AC = 10, and BC = 17. Let X be the intersection of the angle bisector of \angle A with side \overline{BC}, and let Y be the foot of the perpendicular from X to side \overline{AC}. Compute the length of \overline{XY}.

Equilateral triangle ABC and a circle with center O are constructed such that \overline{BC} is a chord of the circle and point A is the circumcenter of \triangle BCO in its interior. If the area of circle with center O is 48\pi, then what is the area of triangle ABC?

In a triangle ABC, take point D on \overline{BC} such that DB = 14, DA = 13, DC = 4, and the circumcircles of triangles ADB and ADC have the same radius. Find the area of triangle ABC.

Let

denote the circular region bounded by x^2 + y^2 = 36. The lines x = 4 and y = 3 partition

into four regions

. Let

denote the area of region

If

then compute

yz=xyz-radius of semicircle??

am i supposed to bash with substitution?

any feedback on the 2nd problem?

If A is an acute angle such that \tan A + \sec A = 2, then find \cos A.

Find the largest real number x for which there exists a real number y such that x^2 + y^2 = 2x + 2y.

aggh... i thought 25 + a = 36 and a was 9. the last coordinate is 11/5.

i got the bisecting square problem. the answer was -5/2.

for the 2nd one you tell me to use perpendicular bisectors. how?

for the square, how can a line with slope 6 bisect the square?

oh.... so the area is 20/3 right??

Let P = (5,1), and let Q be the reflection of P in the line y = \frac{1}{2} x + 2. Find the coordinates of Q.