math
posted by mike .
find the area of a triangle with the base 1 1/4 and height 4/9 ( Hint the area of a traingle is equals half the product of its base and height ) I came up with .55 or 11/20 is this correct ???

No. First to multiply fractions, we change mixed number into improper fraction. The mixed number here is 1 1/4. To change this, we multiply the denominator (the 4) to the constant (the first 1, not the 1 above the bar line) and add this to numerator. thus,
1 1/4 = (1*4 + 1)/4 = 5/4
then recall that the area of triangle is given by
A = (1/2)bh
where b is base and h is height
substituting,
A = (1/2) * (5/4) * (4/9)
to multiply fractions, we just multiply the numerator by numerator & denominator by denominator:
A = (1 * 5 * 4) / (2 * 4 * 9)
A = 20/72
A = 5/18
hope this helps~ :)
Respond to this Question
Similar Questions

math
ABC is a rightangled triangle atB. AB=(3x+2)cm and BC=2CM.GIVEN THAT THE AREA OF THE TRIANGLE IS 85CM SQUARE FIND THE VALUE OF X. Say that the height= 3x+2 base= 2 Area of a triangle equals 1/2 base times height so... (1/2) of the … 
Algebra Word Problem
COULD SOMEONE PLEASE HELP ME WITH THIS !!!!!!!!!! The base of a triangle is 3cm greater than the height. The area is 44cm^2. Find the height and length of the base. The height of the triangle is_______ cm The base of the traingle is_______cm 
10th grade
The area (A) of any triangle is half the product of its base (b) and the height (h). If the base of a triangle is 16mm and it's height is 3mm, what is the area? 
Math
A triangle has a base of 10 inches and a height of 20 inches. If the area of a triangle is one  half the product of its base and height, what is 20 % of its area? 
Pre algebra
find the area of the triangle with base 2 1/5 yards and height 5/8 yard.( The area of a triangle equals half the product of its base and height) 
Math
Find the area of a circle with a radius of 8 cm. Use 3.14 for pi. Type your answer as a number only. Find the area of a triangle with a base of 6 cm and a height of 3 cm. Remember your formula. Question 4 Find the area of a figure … 
Algebra
A triangle has an area of 60 in^2. Its base is 10 inches and its height is √x inches. What is the value of x? 
Math
Find the area of the triangle with the base 1 2/5 yards and height 5/9 yards. The area of the triangle equals half of the product base and height. The area is ____yd^2 (Type whole number or a simplified fraction) I came up with 35/108 … 
math  pls check my work!
help pls asap!!! Check my work! 1. Find the area for the following figure. (trapazoid: bottom base 16.3, top base 5.9, height 4.6) 51.06 m^2*** 74.98 m^2 27.14 m^2 102.12 m^2 2. Find the area for the following figure. (1 point) (triangle: … 
Algebra  PLEASE HELP!
Can you PLEASE help me with this problem?