Area of a Parallelogram

Find the area of the following parallelogram: 

Look at the figure below.

Areas of which of these triangles is equal to $△\mathrm{BCD}$?

Look at the figure below.

Areas of which of these triangles are equal?

In the figure below $ABCD$ is rhombus. Also $BE \left|\right| AC$ and $CE \left|\right| AB$.

What is the ratio of the area of $ABCD$ to that of $ABED$?

In the figure below $\mathrm{ABCD}$ is a rhombus and

$\mathrm{ABEC}$ is a parallelogram. $\mathrm{AD}=25 \mathrm{m}$ and $\mathrm{BE}=30 \mathrm{cm}$.

What is the length of $\mathrm{BD}$?

Which of the following formulae gives the area of $△\mathrm{ABDC}$ below?

Which of the following formulae gives the area of $△\mathrm{ADC}$ below?

The area of ∆ ABC and ∆DEF is 256 sq cm. Length of side AB and side DE is 16 cm. If the altitude corresponding to side AB is 32 cm, the altitude corresponding to side DE of ∆DEF is _____ cm.

Shown below is the earth’s orbit around the Sun. According to Kepler’s law of planetary motion, the earth sweeps equal areas (triangular area shown below) in equal intervals of time.

Murali is trying to apply the area formula of triangles to study the speed of the earth as it revolves around the sun.

Which of the following statements is correct regarding the speed of earth along the elliptical orbit?

If the sum of the lengths of a parallelogram is $ \frac{a}{6}$ cm and sum of widths is $ \frac{b}{6}$ cm, perimeter of the parallelogram is,

The sum of the length and width of a parallelogram is 70cm. Is there any data missing to calculate the perimeter of the parallelogram?

Mahesh took the measurements around a tile and found it to be 60 inches. What is this measurement?

Perimeter of the parallelogram is _____ cm.