We know that parallelogram is also a quadrilateral. Let us split such quadrilateral into two triangles. Find their areas and subsequently that of the parallelogram. Does this process in turn with the formula that you already know?

We know that parallelogram is also a quadrilateral. Let us split such a quadrilateral into two triangles. Find their areas and subsequently that of the parallelogram. Does this process in tune with the formula that you already know?

What would happen if the quadrilateral is not convex? Consider quadrilateral ABCD. Split it into two triangles and find the sum of the interior angles. What is the sum of interior angles of a concave quadrilateral?

Represent the following situations with suitable mathematical equations. The hypotenuse of a right triangle is 25 cm. We know that the difference in lengths of the other two sides is 5 cm. We would like to find out the length of the two sides?

Draw circles having different radius on à graph paper. Find the area by counting the number of squares, Also find the area by using formula. Compare the two answers.

The two adjacent sides of a parallelogram are 2hati-4hatj+5kandhati-2hatj-3hatk . Find the unit vector parallel to its diagonal Also , find its area.

Think of this puzzle What do you need to find a chosen number from this square? Four of the clues below are true but do nothing to help in finding the number. Four of the clues are necessary for finding it. Here are eight clues to use: a. The number is greater than 9. b. The number is not a multiple of 10. c. The number is a multiple of 7. d. The number is odd. e. The number is not a multiple of 11. f. The number is less than 200. g. Its ones digit is larger than its tens digit. h. Its tens digit is odd. What is the number? Can you sort out the four clues that help and the four clues that do not help in finding it? First follow the clues and strike off the number which comes out from it. Like - from the first clue we come to know that the number is not from 1 to 9. (strike off numbers from 1 to 9). After completing the puzzle, see which clue is important and which is not?

Do you know we also use some particulate pollutants? Could you list some of them?

Represent the following situations mathematically The hypotenuse of a right triangle is 25cm. We know that the difference in lengths of the other two sides is 5 cm. We would like to find out the length of the two sides.