# Modifiable Solid: Isosceles Triangle (Modifiable) Cross Sections Parallel to yAxis

## HOW TO USE:

Enter any slider to change the congruent base angles of this isosceles triangular cross section.
You can move this

**UPPER FUNCTION**(labeled upper(x)). Enter any**LOWER FUNCTION**(labeled lower(x)). Enter your**lower and upper limits of integration**("a" and "b", respectively). Slide the**FILLING**slider all the way to the left. For this solid, note how cross sections parallel to the yAxis are**isosceles triangles**. The base of this**isosceles triangle**has length**upper(x) - lower(x)**. You can use the**isosceles triangle**by sliding the MoveMe slider. You can modify any of these parameters (functions, limits) at any time.**To explore in augmented reality, see the directions below this applet.**## TO EXPLORE IN AUGMENTED REALITY:

1) Open up GeoGebra 3D app on your device.
2) Go to the .
(Be sure to leave everything else alone.)

**MENU**(horizontal bars) in the upper left corner. Select OPEN. In the Search GeoGebra Resources input box, type**f97crzkb**. (Note this is the resource ID = last 8 digits of the URL for this resource.) 3) In the resource that uploads, zoom in/out if needed. You can alter the functions upper(x), lower(x). You can also move sliders a, b, MoveMe, Filling, and## Quick (Silent) Demo

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