Question

Answer 1

`a)` Xét t/g `VSTU` có: `\hat{V}+\hat{S}+\hat{T}+\hat{U}=360^o`

   `=>110^o +\hat{S}+75^o +75^o =360^o`

   `=>\hat{S}=100^o`

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`b)` Xét t/g `PQST` có: `\hat{P}+\hat{Q}+\hat{S}+\hat{T}=360^o`

  `=>90^o +70^o +\hat{S}+90^o =360^o`

  `=>\hat{S}=110^o`

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`c)` Có: `\hat{TSV}=180^o -60^o =120^o`

Xét t/g `TSVU` có: `\hat{T}+\hat{TSV}+\hat{V}+\hat{U}=360^o`

   `=>65^o +120^o +\hat{V}+115^o =360^o`

   `=>\hat{V}=60^o`

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`d)` Xét t/g `TSRU` có: `\hat{T}+\hat{S}+\hat{R}+\hat{U}=360^o`

    `=>80^o +\hat{S}+70^o +100^o  =360^o`

    `=>\hat{S}=110^o`