Question

the perimete tryr of a triangle is 450m . the ratio of i ints side's are 13:12:5 using herons formula find the area of the triangle​ by​

Answer 1

$\huge\mathtt{\fbox{\red{Answer✍︎}}}$

$\large\underline\mathfrak{\pink{GIVEN,}}$

$\dashrightarrow \red{ Perimeter\:of\: triangle= 450m}$

$\dashrightarrow \orange{ratios\:of\:the\:sides\:of\:triangles\:are }\\ \dashrightarrow \pink{13:12:5}$

$\large{\boxed{\bf{ \mathfrak{\blue{FORMULA,}}}}}$

$\rm{\boxed{\sf{ \large{\circ}\:\: area\:of\:triangle_{(herons\:fomula)}= \sqrt{s(s - a)(s - b)(s - c)} \:\: \large{\circ}}}}$

$\large\underline\mathfrak{\pink{TO\:FIND,}}$

$\dashrightarrow \green{Area\:of\:triangle\:using\:herons\: formula.}$

$\large\underline\mathfrak{\purple{SOLUTION,}}$

$\therefore \green{let\:the\:constant\:be\:'x'\:m}$

$\dashrightarrow \red{sides\:of\:triangle\: are,}\\ \dashrightarrow \blue{a=13x} \\ \purple{b= 12x }\\ \green{c= 5x }$

$\therefore \orange{finding\:the\:value\:of\:x.}$

$\dashrightarrow \purple{perimeter\:of\:triangle= a+b+c}$

$\dashrightarrow \blue{13x+12x+5x=450}$

$\implies \green{30x=450}$

$\implies \green{x= \dfrac{450}{30} }$

$\implies \green{x = \cancel\dfrac{450}{30}}$

$\implies \green{x=15}$

$\rm{\boxed{\bf{ \:\: x=15 \:\: }}}$

$\dashrightarrow \red{x=15}\\ \pink{a= 13x= 13\times 15= 195m}\\ \blue{\dashrightarrow b=12x= 12\times 15 = 180m}\\ \dashrightarrow \purple{c=5x= 5\times 15= 75m}$

NOW, FINDING AREA OF TRIANGLE BY HERONS FORMULA,

$\therefore \orange{s= \dfrac{a+b+c}{2}}$

$\implies \orange{ s= \dfrac{195+180+75}{2}}$

$\implies \orange{s= \dfrac{450}{2}}$

$\implies \orange{s= 225}$

$\bf\dashrightarrow \red{area\:of\:triangle_{(herons\:fomula)}= \sqrt{s(s - a)(s - b)(s - c)}}$

$\implies \purple{\sqrt{225(225-195)(225-180)(225-75)}}$

$\implies \purple{ \sqrt{225(30)(45)(150)}}$

$\implies \purple{\sqrt{ 225(1350)(150)}}$

$\implies \purple{15\sqrt{202500}}$

$\implies \purple{15 \times 450}$

$\implies \purple{6750m^2}$

$\rm{\boxed{\sf{ \large{\circ}\:\:area\:of\:triangle= 6750m^2 \:\: \large{\circ}}}}$

$\rm\underline\mathfrak{\pink{AREA\:OF\:TRIANGLE\:IS\:6750m^2.}}$

Answer 2

GIVEN

• Perimeter of Triangle = 450 m
• Ratio of sides of triangle = 13:12:5

TO FIND

• The area of triangle by using heron's formula.

SOLUTION

Let the Side be

• a = 13x
• b = 12x
• c = 5x

Perimeter = (a+b+c)

450 = 30x

x = 15

Side are

• a = 195
• b = 180
• c = 75

$\small \bf \: AREA\ OF\ TRIANGLE\ BY\ HERONS\ FORMULA, \\ \\ \therefore \boxed{ \tt \: s= \dfrac{a+b+c}{2} } \\ \\ \sf s= \dfrac{195+180+75}{2} \\ \sf s= \dfrac{450}{2} \\ \sf s= 225 \\ \\ \scriptsize \tt \: area\:of\:triangle_{(herons\:fomula)}= \sqrt{s(s - a)(s - b)(s - c)} \\ \sf \sqrt{225(225-195)(225-180)(225-75)} \\ \sf \sqrt{225(30)(45)(150)} \\ \sf \sqrt{ 225(1350)(150)} \\ \sf 15\sqrt{202500} \\ \sf 15 \times 450 \\ \sf 6750m^2 \\ \\ \red{\small\boxed{\bold{AREA \: \:OF \: \:TRIANGLE \: \:IS \: \: \:6750m^2}} }$

Answer 3

GIVEN

• Perimeter of Triangle = 450 m
• Ratio of sides of triangle = 13:12:5

TO FIND

• The area of triangle by using heron's formula.

SOLUTION

Let the Side be

• a = 13x
• b = 12x
• c = 5x

Perimeter = (a+b+c)

450 = 30x

x = 15

Side are

• a = 195
• b = 180
• c = 75

$\small\boxed{ \bf \: AREA\ OF\ TRIANGLE\ BY\ HERONS\ FORMULA} \\ \\ \therefore \boxed{ \tt \: s= \dfrac{a+b+c}{2} } \\ \\ \sf s= \dfrac{195+180+75}{2} \\ \sf s= \dfrac{450}{2} \\ \sf s= 225 \\ \\ \scriptsize \tt \: area\:of\:triangle_{(herons\:fomula)}= \sqrt{s(s - a)(s - b)(s - c)} \\ \sf \sqrt{225(225-195)(225-180)(225-75)} \\ \sf \sqrt{225(30)(45)(150)} \\ \sf \sqrt{ 225(1350)(150)} \\ \sf 15\sqrt{202500} \\ \sf 15 \times 450 \\ \sf 6750m^2 \\ \\ \red{\small\boxed{\bold{AREA \: \:OF \: \:TRIANGLE \: \:IS \: \: \:6750m^2}} }$