Question

Please answer 9 question⤴️


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Answer 1

Answer:

1) Perimeter of Triangle

add All The sides

7.8 cm + 6.5 cm + 5.9cm

answer -20.2cm

2) Equilateral Triangle Means All Sides are equal

9.4cm ×3 (Triangle Has 3 sides )

answer - 28.2 cm

3) isosceles Triangle Means 2 equal Sides

so 8.5cm + 8.5cm + 7cm

answer - 24cm

Step-by-step explanation:

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Answer 2

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• Pᴇʀɪᴍᴇᴛᴇʀ ᴏғ ᴛʀɪᴀɴɢʟᴇ = Sᴜᴍ ᴏғ ʟᴇɴɢᴛʜs ᴏғ ɪᴛs sɪᴅᴇs

( i )

Tʜᴇ sɪᴅᴇs ᴀʀᴇ ɢɪᴠᴇɴ sᴏ ᴡᴇ ᴡɪʟʟ sɪᴍᴘʟʏ ᴀᴅᴅ ᴛʜᴇᴍ ᴛᴏ ɢᴇᴛ ᴛʜᴇ ᴘᴇʀɪᴍᴇᴛᴇʀ .

= ( 7.8 + 6.5 + 5.9 )cm .

= 20.2 cm .

( ii )

Tʜᴇ ᴛʀɪᴀɴɢʟᴇ ɪs ɢɪᴠᴇɴ ᴇϙᴜɪʟᴀᴛᴇʀᴀʟ . Sᴏ, ᴀʟʟ ᴏғ ɪᴛs sɪᴅᴇs ᴡɪʟʟ ʙᴇ ᴇϙᴜᴀʟ . ɪ.ᴇ = 9.4 ᴄᴍ .

Pᴇʀɪᴍᴇᴛᴇʀ = ( 9.4 + 9.4 + 9.4 )ᴄᴍ

= 28.2 ᴄᴍ .

( iii )

Tʜᴇ ᴛʀɪᴀɴɢʟᴇ ɪs ɢɪᴠᴇɴ ɪsᴏsᴄᴇʟᴇs . Sᴏ, ᴛᴡᴏ ᴏғ ɪᴛs sɪᴅᴇs ᴡɪʟʟ ʙᴇ ᴇϙᴜᴀʟ ᴀɴᴅ 1 sɪᴅᴇ ᴡɪʟʟ ʙᴇ ᴜɴᴇϙᴜᴀʟ .

Iɴ ᴛʜɪs ᴄᴀsᴇ ᴛʜᴇ ᴛᴡᴏ sɪᴅᴇs ɪs ᴏғ ʟᴇɴɢᴛʜ 8.4 ᴄᴍ & ᴜɴᴇϙᴜᴀʟ sɪᴅᴇ ɪs ᴏғ ʟᴇɴɢᴛʜ 7ᴄᴍ .

Pᴇʀɪᴍᴇᴛᴇʀ = ( 8.5 + 8.5 + 7 )ᴄᴍ

= 24 ᴄᴍ .

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