Question

Class 9th
Mathematics
Chapter 9 - Areas of parellogram and triangles
Formulas Needed . Give 1 example for each Formuals

Note : Don't copy, Don't spam.

Quality answer with good explanation will be Brainliest .​

Answer 1

Area of a parallelogram = b×h

Area of a triangle = (1/2)×b×h

Hope it helps (＾-＾)

Answer 2

$\green{\small\sf\underline{about \: some \: plane \: figures - }}$

$\bold{ \mapsto \: what \: are \: plain \: figures \:?}$

$\star\sf{ \: plain \: figures \: are \: those \: figures \:which \: do \: not \: any \: thickness. }$

$\bold{\mapsto \: examples \: of \: plain \: figures \: ? }$

$\sf\star{ \: examples \: include - } \\ \leadsto \: square \\ \leadsto \: rectangle \\ \leadsto \: circle \\ \leadsto \: parallelogram \\ etc...$

________________________________

$\mapsto \:\bold{area \: of \: triangle \: ? }$

$\leadsto \: \sf{formulae} \: \blacktriangledown$

$\color{blue}1. \: \sf{area \: of \: \triangle = \frac{1}{2} \: base \times height}$

$\bold{example - } \\ \bigstar \: \sf{find \: area \: of \: triangle \: ?} \\ \bold{\star \: when \: - \: base = 6 \: and \: height = 10}$

$\sf\huge\green{answer}$

$\pink{area = \frac{1}{2} \times base \times height} \\ \blue{\frac{1}{2} \times 6 \times 10 = {30 \: cm}^{2}}$

$\color{blue}2. \: area \: of \: \triangle = \sqrt{s(s - a)(s - b)(s - c)} \\ where - \\ \star \: a \: \star\: b \: and \star\: c \\ are \: the \: sides \: of \: the \: triangle \: and \: s \: is \: the \: semiperimeter \: of \: the \: triangle$

$\bold{\mapsto \: area \: of \: parallelogram \: ? }$

$\leadsto \sf{formulae} \: \blacktriangledown$

$\color{blue}1. \sf \: area \: of \: parallelogram = base \times height$

$\bold{example - } \\ \bigstar \: \sf \: find \: area \: of \: parallelogram \: ? \\ \bold{\star \: when \: - \: base = 8 \: cm \: and \: height = 3 \: cm \:}$

$\huge \sf\green{answer}$

$\dagger \: \pink{area = base \times height} \\ \blue{= 8 \times 3 = {24 \: cm}^{2}}$

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