In this activity, students construct isosceles and equilateral triangles. They discover that if two sides of a triangle are congruent, then the angles opposite them are congruent. They understand that an equilateral triangle is also equiangular. https//education.ti.com/en/activity/detail?id=BD7E404E347945CCB4701A19DE9EFF9A
Students explore the properties of triangles formed by connecting the midpoints of two sides of a triangle, and examine the relationship between the two triangles. They study the Triangle Midsegment theorem. https//education.ti.com/en/activity/detail?id=CC4125C44C904F54A847A8870ADC4C21
In this activity, students examine the location of the circumcenter and incenter for different triangles. https//education.ti.com/en/activity/detail?id=80B27E0E20D84E75BC3677625DDBF21F
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