# geometry

posted by .

what is the area of a rhombus if AB equals 9.9 and AC equals 13 and DB equals 15?

• geometry -

Since a rhombus has equal sides, the lines AC and BD intersect at right angles, dividing it into four congruent triangles.

The total area is (4)*(1/2)*(4.45)(6.5)
= (1/2)(9)(13) = 58.5

• geometry (correction) -

I misread the problem by using 9 for one of the diagonals. The answer should be
A = (1/2)(13)(15) = 97.5

Note that you not have to use the value of AB. Its value, for a true rhombus, should be sqrt[(6.5)^2 + (7.5)^2] = 9.92 , which is close to what was given.

## Similar Questions

1. ### Calculus

Find the exact coordinates of the centroid. y = sqrt[x], y = 0, x = 9. -------------- Is this basically 1/4 of an oval/ellipse?
2. ### Pre-Algebra

If negative 20 equals 168, negative 15 equals 153, negative 10 equals 138, negative 5 equals 123, 0 equals 108, 5 equals 93, 10 equals 78, 15 equals 63, 20 equals 48, then what is the rule?
3. ### Pre-Algebra

If negative 20 equals 168, negative 15 equals 153, negative 10 equals 138, negative 5 equals 123, 0 equals 108, 5 equals 93, 10 equals 78, 15 equals 63, 20 equals 48, then what is the rule?
4. ### algebra

Could someone show me how to solve this joint variation problems?
5. ### Math

1. 24 quarts equals 6 gallons? 2. 5 cups equals 40 quarts?
6. ### geometry

ABCD is similar to WXYZ ad equals 6, dc equals 3, and wz equals 59 find YZ
7. ### geometry

ABCD is a quadrilateral with BC perpendicular to AB and DE is perpindicular to AB. If AB is 38 yard and EB equals 18 yards, BC equals 13 yards, and DE equals 15 yards. Find the area of ABCD
8. ### geometry

Construct trapezium ABCD so that BC equals 6cm,AB equals 3cm,Angle B equals 80degrees and angle C equals 70 degrees.measure BD
9. ### maths

f(x)equals to 2x is in form of y equals to ax or y equals to af(x) (if f(x)equals to x) plot f(x) equals to 2x
10. ### math

Let f of x equals 4 for x less than or equal to 3 and equals the quantity 7 minus x for x greater than 3. Use geometric formulas to evaluate the integral from x equals 1 to x equals 7 of f of x, dx. I got 16 but i dont think it is …

More Similar Questions