Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

Find the area of a triangle two sides of which  are 18 cm and 10cm and the perimeter is 42 cm
Asked by digantverma08 | 14 Aug, 2015, 02:10: PM
answered-by-expert Expert Answer
begin mathsize 12px style F i r s t space s i d e space o f space t h e space t r i a n g l e space equals space a space equals space 18 space c m S e c o n d space s i d e space o f space t h e space t r i a n g l e space equals space b space equals space 10 space c m T h i r d space s i d e space o f space t h e space t r i a n g l e space equals space c a space plus space b space equals space 18 space plus space 10 space equals space 28 space c m P e r i m e t e r space o f space t h e space t r i a n g l e space equals space a space plus space b space plus space c space equals space 42 space c m H e n c e comma space c space equals space 42 space c m space minus space 28 space c m space equals space 14 space c m A l s o comma space s space equals space fraction numerator a space plus space b space plus space c over denominator 2 end fraction equals 42 over 2 equals 21 N o w comma space b y space H e r o n apostrophe s space f o r m u l a comma A r e a space o f space t h e space t r i a n g l e space equals space A space equals space square root of s left parenthesis s minus a right parenthesis left parenthesis s minus b right parenthesis left parenthesis s minus c right parenthesis end root A space equals space square root of 21 left parenthesis 21 minus 18 right parenthesis left parenthesis 21 minus 10 right parenthesis left parenthesis 21 minus 14 right parenthesis end root A space equals space square root of 21 cross times 3 cross times 11 cross times 7 end root A space equals square root of 21 cross times 21 cross times 11 end root A space equals space 21 square root of 11 space c m squared end style
Answered by Kajal Gupta | 14 Aug, 2015, 04:19: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 9 - Maths
find the area of triangle whose sides are 40cm,24 cm,32cm?
Asked by seemarajpoot01101986 | 29 Nov, 2023, 04:40: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
find the area of a triangle two sides of which are 18cm and 10cm and it's perimeter is 42cm
Asked by shrikantsalunkhe1012 | 10 Jun, 2023, 06:47: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Area of an isosceles right angled triangle is 50cm ² find the length of equal side
Asked by vasumathir1978 | 25 Aug, 2021, 11:08: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
the perimeter of a triangular field is 280 dm. If two of its sides are 78 dm and 50 dm,find the length of the perpendicular on the side of length 50 dm from the opposite vertex.
Asked by saanvichhikara07 | 23 Sep, 2020, 08:10: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
there is a slide in a park. One of its side walls has been painted in some colour with a message "keep the park clean and green if the sides of the wall are 1511 and 6 cm find the area painted in colour
Asked by kynarahman | 20 Aug, 2020, 07:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Two sides of a triangle are 8cm and 11cm and it's perimeter is 32cm.The third side is : a)4cm b)13cm c)14cm d)16cm
Asked by arumugaperumalr17 | 09 Aug, 2020, 10:00: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
a parallelogram has two sides 16cm and 25 cm and the diagonal is 65m long .find the area of the parallelogram
Asked by gauravbhardwaj65950 | 25 Apr, 2020, 09:45: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
Aapka it in the shape of a square with diagonal 32 cm and an isosceles triangle of days. It's and and side 6 cm each has to be made of three different Shades as known as shown in the figure 12.17 how much paper of a ship has been used in
Asked by kirtisatpute995 | 14 Feb, 2020, 11:22: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
A kite in the shape of a square with a diagonal 32 cm and Isis kilis triangle of base 8 cm and side 6 cm each is to be made of three different Shades as shown in the figure 12.17 how much paper of each shade has been used in it. Has been used in it.
question image
Asked by kirtisatpute995 | 14 Feb, 2020, 11:21: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Maths
A triangle has sides 35 cm 54 cm and 61 cm long find its area also find the smallest of it's altitude altitude altitude
Asked by karanbora625 | 29 Oct, 2019, 12:16: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×