Finding Angle Measures In Polygons

A video on the sum of internal angles of a polygon and on the sum of exterior angle measures.

[@ettajoanne]

Clear explanation and great delivery. Thank you for helping my daughter out in 2021 :))))

[@ebiljesse2453]

2021:)

[@ebiljesse2453]

1st sept

[@mimi-iy7jv]

thank u so much im teacher explains everything in a weird way, now ill finally pass thanks to u

[@khasturysz9897]

OMG it's really helpful thanks to you! I am an IGCSE studentso I did not know how to do this calculation!! Thanks so much u saved my day🥰🥰🥰🥰

[@zeshukitagora7694]

thank so much because of you i was able to sleep at 12:30 thank so much

[@nancygestiada]

Thank you 🎉🎉🎉

[@milesparks1169]

great video I found it very helpfull thank you

[@thegumball1809]

Nice headset! Very professional

[@luluobaid4087]

thank you very much 😍

[@elizabethadeosun4620]

Thank you so much

[@ameliaaa3518]

Thanks for helping me

[@chaupow2977]

thanks for the help

[@rashidakhan4185]

Please help me find the value of y in a pentagon if 89°,y,130°,71°,y-10 please reply sooner

[@saranyadurairaj3988]

How can you take unknow angle equal to x? Is it possible

[@Phei.]

Nice video! keep it up. =)

[@victorgachuki493]

Nice video

[@cstann1523]

Answer for the hilarious joke= "Gee im a tree" for anyone wondering out there.

[@elisabelrivera6205]

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[@riseupredsea3933]

its not really funny

[@riseupredsea3933]

good video.

[@Linda-be3ki]

thank you so much you saved my life

[@Ramakizaraki]

Helped 👍👍

[@nurually3081]

Excellent

[@annaleedames5306]

Thank you so much I get 100 on my work I am in grade 7

[@chocoais6601]

Thank you for this video!

[@aadhavjaimurugesh2734]

Do you use the McDougal Littell Geometry TextBook (Texas)?

[@dciske]

AstroAstro It might have been? But not Texas. This is a few years back. We are now using a Pearson book but I think it might have been a McDougal Littell at the time.

[@aadhavjaimurugesh2734]

@@dciske Oh Ok thanks Just asking...

[@arasansaravanan3875]

tnks :)

[@rashidakhan4185]

Please help me find the value of y in a pentagon if 89°,y,130°,71°,y-10

[@dciske]

A pentagon has five sides so to find the sum of the measures of the internal angles set n=5. (5-2)180 = 540. That's the sum of the internal measures. The equation you then need to solve for y is 89 + y + 130 + 71 + (y-10) = 540 combine like terms: 2y + 280 = 540 subtract 280 from both sides 2y = 260 divide both sides by 2 y = 130

[@whospaula]

hi mrs. ciske, for some reason, I’m here

[@f.hansen5363]

I was with you until the last one. With the x + (×+20)+112+96 = 360 after that you went to 2x + 228 = 360 . Wjere did the + 20 in the () go??

[@lianobarbosa8438]

😁😁 you said x is equal to 108 i said o my god i m confused

[@ataifimran2033]

hello

[@rashidakhan4185]

Please.please now need to attend class in the morning

[@zephral5142]

1:44 I'm grade 6 and confused on how it's a 4 also why does it have to be 180

[@dciske]

It's a 4 because you plug in the number of sides into the formula. The figure has six sides. So (n-2) is (6-2) which is 4. I'd like to go more deeply into where the 180 comes from, but it's a little hard in comments. It was to do with how many triangles are formed when you drop diagonals in the polygon. I'm sure you could find some videos explaining a proof of the formula. Good luck!

[@zephral5142]

@@dciske ah I understand now thank you!

[@jadahaye5754]

😭😭😭😭💔💔I'm sorry but I'm slow in maths, what should I divide to get 206???? You said divide the two sides with 334

[@dciske]

I subtracted 334 from both sides then divided both sides by 2 to isolate the x.

[@faust.f]

Basit

[@sudiptanag9308]

ma'am please tell us how to calculate the area of polygon(pentagon to do decagon ). Sudipta /India

[@danaemk]

For the type of problem I'm doing here, I don't have enough info. If I had side lengths, I could break the shape up into a series of triangles and find the area of the triangles.

[@sudiptanag9308]

ok ma'am i ll back u soon with full of info

[@incredible4066]

Please learn before

[@floridabeach6803]

lamest joke ever😂by whatever i got the concept

[@johnptak3356]

Good joke

[@charliefinkel7851]

G I’m a tree