user avatar
user avatar
user avatar
RicardoCruz
  • Member for 9 years, 11 months
  • Last seen more than a week ago
14 votes

Need to find the ellipse of maximum area inscribed in a semicircle.

13 votes

A construction using straightedge and compass

10 votes
Accepted

Equations For Quadratic Regression

9 votes
Accepted

Geometrical construction problem (2)

8 votes
Accepted

Can you divide a square into 5 equal area regions

7 votes

Proofs without words of some well-known historical values of $\pi$?

7 votes

Decomposing polynomials with integer coefficients

6 votes

Prove concurrency of triangle altitudes with vector algebra?

6 votes

Find all values of a for which the equation $x^4 +(a-1)x^3 +x^2 +(a-1)x+1=0$ possesses at least two distinct negative roots

6 votes
Accepted

Geometric derivation of the quadratic equation

5 votes

The diagonals of a trapezoid are perpendicular and have lengths 8 and 10. Find the length of the median of the trapezoid.

5 votes
Accepted

A geometry problem proposed at national olympiad.

4 votes
Accepted

Integral by partial fractions

4 votes
Accepted

The area of a triangle determined by the bisectors.

4 votes

Sangaku. How to draw those three circles with only a ruler and a compass?

4 votes

Different ways to work out the normal in the Frenet frame

4 votes

Find all functions $F(x,y)$ such as $\frac{\sqrt{3}}{2}\frac{\partial{f}}{\partial{x}}+\frac{1}{2}\frac{\partial{f}}{\partial{y}}=0$

4 votes

Mental estimate for tangent of an angle (from $0$ to $90$ degrees)

4 votes
Accepted

Find the area of shaded triangle inside of a rectangle.

3 votes

Prove that this segment bisects another

3 votes

Proving that function $f:[0,\infty)\rightarrow [0,\infty)$ defined by $f(x)=\frac{x^2}{1-x}$ is bijective.

3 votes

Alternative form of equation of circle?

3 votes

How can we construct C between A and B s.t. AB = α AC with compass-straightedge method?

3 votes

Demonstrating that a cycloid solves the Tautochrone Problem

3 votes
Accepted

Size of new box rotated and the rescaled

3 votes

Polynomial approximation of circle or ellipse

3 votes

Construct quadrangle with given angles and perpendicular diagonals

3 votes
Accepted

What is the best way to inscribe a golden rectangle into a pentagon? Do more golden ratios emerge?

3 votes

How to build a trapezoid

3 votes

Cubic equation with circle intersection to form a square