21. Find the perimeter of the triangle: 60 degrees, 60 degrees,
[tex]4 \sqrt{15 } [/tex]
​

Answer:

120+ 4(square root)15

120+15.49=135.49

135.49 is the perimeter

The perimeter of the triangle having two angles 60 degrees, 60 degrees, and one side [tex]4\sqrt{15}[/tex] is, [tex]12\sqrt{15}[/tex] or 46.47

Perimeter is a mathematical term, which means total outer boundary of a figure, we define it only for two dimensional figures.

Perimeter = Sum of length of the all the sides

Given that,

the triangle having two angles 60 degrees, 60 degrees,

and one side

It is known that, total sum of all the angles of triangle is 180°

A = 60°

B = 60°

C = ?

A + B + C = 180°

60° + 60° + C =  180°

C =60°

Hence, it is a equilateral triangle

And for equilateral triangle length of all sides are equal

a =  [tex]4\sqrt{15}[/tex]

b =  [tex]4\sqrt{15}[/tex]

c =   [tex]4\sqrt{15}[/tex]

Perimeter =  [tex]4\sqrt{15}[/tex] +  [tex]4\sqrt{15}[/tex] +  [tex]4\sqrt{15}[/tex]

Perimeter = 12√15

So, the perimeter is 12√15

To know more about Perimeter check:

https://brainly.com/question/6465134

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वादविवाद प्रतियोगितामा भाग लिने वक्ताले बोल्दाखेरी
केके हुन् ?
दोर्जे शेर्पाले बुद्धिका पक्षमा

तर्कहरू छोटकरीम
अनिशा आलेले विषयको विपक्षमा कस्ताकस्ता तर्कहरू
तिमीलाई बल र बुद्धिमध्ये कुन चाहिँ बढी महत्त्वपूर्ण
लेख।
नभन्दा विद्या ठुलो भन्ने विषयको पक्षमा आफ्ना गह
किझकाउ लुगाभन्दा मिठो र स्वस्थ खानेकुरा ख
पक्षमा आफ्ना गहकिला तर्कहरू लेख।
[tex]15 \times 5 \\ \\ [/tex]
​

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